Dec. 2 (UPI) -- The 2020 presidential campaign features a diverse slate of Democrats -- and one Republican -- vying to challenge President Donald Trump.
It might be the most diverse group of Democrats ever to seek the United States' highest office. The nation's first female, Hindu, American Samoan, openly gay or Latin president could be among the bunch.
On the Republican side, one candidate remains to challenge Trump in the primary season.
Here's a look at the candidates:Democrats Michael Bennet
Sen. Michael Bennet, one of two Coloradans running for president in 2020, announced his campaign on May 2.
In the weeks after his announcement, he touched on a number of key issues, including increasing employee wages, and making housing, healthcare, childcare and higher education more affordable.Joe Biden
Former Vice President Joe Biden announced his campaign April 25, citing racial violence in Charlottesville, Va., in 2017 as a motivation.
"I cannot stand by and watch that happen. Everything that makes America America is at stake. That's why today I'm announcing my candidacy for president of the United States," he said in his announcement.Michael Bloomberg
The former Republican and New York City mayor announced his candidacy on Nov. 24 after days of indications he was preparing to enter the Democratic primary race.
Bloomberg, New York City's mayor for 12 years, cited Trump's administration as his primary reason for entering the field.
"We cannot afford four more years of President Trump's reckless and unethical actions," he said.
Bloomberg, who switched party affiliation from Republican to Democrat a year ago, is worth about $54 billion and said he plans to fully fund his own campaign. At age 77, he is the second-oldest candidate in the field after Vermont Sen. Bernie Sanders, and is nine months older than Joe Biden.Cory Booker
Sen. Cory Booker announced his candidacy Feb. 1, touting a record that's become more liberal since he joined the Senate in 2013, showing support for affirmative action, same-sex marriage, a single-payer healthcare system and women's rights.
The former Newark, N.J., mayor has worked across the aisle on criminal sentencing reform, and he has introduced or co-sponsored legislation to legalize marijuana, make lynching a federal crime and to protect special counsel Robert Mueller from being fired amid the Russia election meddling probe.Pete Buttigieg
South Bend, Ind., Mayor Pete Buttigieg announced he was forming a presidential exploratory committee Jan. 23 in his bid to become the first millennial leader of the United States.
The openly gay Afghanistan war veteran has called for abolishing the Electoral College, and combating climate change.Julián Castro
Former Housing and Urban Development Secretary Julián Castro announced his presidential candidacy Jan. 13 from his hometown of San Antonio -- where he also served as mayor. He's leaning on his Obama administration experience and progressive ideas on climate change and healthcare to boost his campaign.
He's shown support for Medicare for all, the Green New Deal on climate change, criminal justice and prison reform and expanded free prekindergarten.John Delaney
Former Rep. John Delaney was the first major Democratic figure to announce his candidacy for president. He revealed the news in an op-ed published by The Washington Post in July 2017.
Delaney touted his business acumen -- he ran two publicly traded companies before age 40 -- and his "fresh perspective" on technological innovation and globalization. He called for new infrastructure and international tax reform, as well as healthcare, immigration and education reform with a focus on volunteerism and public service.Tulsi Gabbard
Gabbard formally announced her candidacy Feb. 2 during a rally in Oahu, Hawaii, where she portrayed herself as a member of a young class of politicians seeking to oust the old guard and existing way of doing business in Washington.
She plans to lean on her military experience to set herself apart from the other candidates, calling for a focus on veterans issues, as well as healthcare, criminal justice reform and climate change.Amy Klobuchar
Sen. Amy Klobuchar announced her candidacy Feb. 10 during a rally in her home state of Minnesota. She said she's running for all Americans, including parents wanting a better education for their children, seniors seeking affordable medication, workers and farmers.
She has also called for more affordable healthcare, online consumer protection, election security, reducing the role of money in politics, automatic voter registration and efforts to reduce climate change.
The former governor of Massachusetts announced Nov. 14 he was entering the Democratic primary. A late entry, Patrick said he decided to run "in a spirit of profound gratitude for all the country has given to me."
Patrick, 63, entered amid concerns among some in the Democratic Party the 2020 field lacks a clear, electable candidate to face Trump.
"This time is about more than removing an unpopular and divisive leader, as important as that is, but about delivering instead for you," he said. "This won't be easy and it shouldn't be. But I'm placing my faith in the people who feel left out and left back who just want a fair shot at a better future."Tom Steyer
A San Francisco billionaire, Steyer announced his entry to the race July 9. He's a former hedge fund manager who crusades against corporate money in politics. He was also the first major Democrat to call for Trump to be impeached.
In 2013, he founded NextGen America, a nonprofit aimed at fighting climate change, promoting social justice and encourage participation in democracy.Elizabeth Warren
Sen. Elizabeth Warren of Massachusetts formed an exploratory committee for a presidential campaign in late December and announced her presidency on Feb. 9, promising to fight for the middle class. She's said she plans to take on corrupt systems and institutions that favor the wealthy while taking advantage of the poor.
She's shown support for a Green New Deal to reduce the effects of global warming, Medicare for all, a new North American trade deal and a reduction in U.S. military presence around the world.Marianne Williamson
Author Marianne Williamson launched her campaign for president on Jan. 29, calling for universal healthcare, a $15 minimum wage, a path to citizenship for immigrants with no serious criminal background and an end to plans to build a wall along the southern border.
She also supports the Green New Deal on climate change and agricultural and environmental reforms to stop chronic disease.Andrew Yang
Entrepreneur Andrew Yang filed the paperwork to run for president in November 2017, calling for a $1,000-per-month universal basic income for all U.S. adults, Medicare for all and a focus on preserving jobs amid an era of automation.
He's also promised to legalize marijuana and pardon all non-violent drug offenders on April 20, 2021.
Massachusetts Rep. Seth Moulton (Aug. 23)
Former Alaska Sen. Mike Gravel (Aug. 6)
Sen. Bernie Sanders of Vermont announced Feb. 19 he will again run for the Democratic nomination. It will be his second consecutive run for president.
Sanders said he moved the Democratic Party to the left during his 2016 campaign, raising issues like Medicare for all, a $15 minimum wage and tuition-free college.
"I'm running for president because, now more than ever, we need leadership that brings us together -- not divides us up," Sanders said. "Women and men, black, white, Latino, Native American, Asian American, gay and straight, young and old, native born and immigrant. Now is the time for us to stand together."Republicans Bill Weld
Former Massachusetts Gov. Bill Weld was the first Republican to challenge Trump, announcing his formal candidacy April 15. He hopes to appeal to the Republicans and independents who don't support Trump, but also don't want a Democrat in office.
"[O]ur president is simply too unstable to carry out the duties of the highest executive office -- which include the specific duty to take care that laws be faithfully executed -- in a competent and professional matter," Weld said. "It upsets me that our energies as a society are being sapped by the president's culture of divisiveness."