Day One at the Republican National Convention in Cleveland (30 images)

Reince Priebus, chairman of the Republican National Committee, today opened up the 2016 Republican National Convention at Cleveland's Quicken Loans Arena. The four-day gathering will culminate with Donald Trump formally accepting the Republican Party's nomination for President.

A woman delegate peers from under her hat on the floor at the Republican National Convention at Quicken Loans Arena in Cleveland, Ohio on July 18, 2016. Donald Trump will formally accept the Republican Party's nomination for President on Thursday night July 21st. Photo by Molly Riley/UPI

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Reince Priebus, chairman of the Republican National Committee, gavels in the first day of the Republican National Convention at Cleveland's Quicken Loans Arena on July 18, 2016. Donald Trump will formally accept the Republican Party's nomination for President on Thursday night July 21st. Photo by Kevin Dietsch/UPI

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Reince Priebus, chairman of the Republican National Committee, gavels in the first day of the Republican National Convention at Cleveland's Quicken Loans Arena on July 18, 2016. Donald Trump will formally accept the Republican Party's nomination for President on Thursday night July 21st. Photo by Kevin Dietsch/UPI

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Police arrive at the Republican National Convention at Quicken Loans Arena in Cleveland, Ohio on July 18, 2016. Donald Trump will formally accept the Republican Party's nomination for President on Thursday night July 21st. Photo by Pete Marovich/UPI

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