Bert Corrigan, of Smithfield, Maine, waits for Republican Presidential candidate Donald Trump to speak at the Merrill Auditorium on August 4, 2016 in Portland, Maine. 'You can't run a campaign against an opponent on character traits,'...More

Protestors holding up copies of the Constitution are escorted out of Republican Presidential candidate Donald Trump's speech at the Merrill Auditorium on August 4, 2016 in Portland, Maine.

Police and workers hawking Trump gear wait outside the Merrill Auditorium before Republican Presidential candidate Donald Trump speaks on August 4, 2016 in Portland, Maine.

Steven Peguero, of Boston, waits for Republican Presidential candidate Donald Trump to speak at the Merrill Auditorium on August 4, 2016 in Portland, Maine.

Protestors of Republican Presidential candidate Donald Trump outside the Merrill Auditorium where he spoke on August 4, 2016 in Portland, Maine. Protestors are, from right, Sonja DiRisi, Sigourney Pena and Sophia Pena, all of...More

A man who declined to be named sells Trump gear as protestors of Republican Presidential candidate Donald Trump line up at the Merrill Auditorium on August 4, 2016 in Portland, Maine.

A young supporter of Republican Presidential candidate Donald Trump waits for him to speak at the Merrill Auditorium on August 4, 2016 in Portland, Maine.

Portland Mayor Ethan Strimling, a Democrat, arrives at Republican Presidential candidate Donald Trump's speech with a copy of the Constitution in his pocket on August 4, 2016 in Portland, Maine.

Republican Presidential candidate Donald Trump speaks at the Merrill Auditorium on August 4, 2016 in Portland, Maine.