Republican presidential candidate Donald Trump address an audience at the The Hotel Roanoke & Conference Center on July 25, 2016 in Roanoke, Virginia.

U.S. Republican presidential nominee Donald Trump said he was taking the gloves off in his battle against Democrat Hillary Clinton in the race for the White House after taking a scorching from speakers at the Democratic National Convention.



Trump wrapped up a five-day, seven-state campaign swing in Colorado on Friday, where for a fifth straight day his supporters chanted "lock her up" whenever he brought up Clinton's name.



Trump supporters say Clinton deserves to be prosecuted for her handling of U.S. foreign policy as President Barack Obama's first-term secretary of state and for her use of a private email server while in that office.



All week Trump has sought to tamp down the chants by stressing that his main goal is to simply beat Clinton in the Nov. 8 presidential election.



But as the crowd chanted the slogan in Colorado Springs, Trump finally relented.



"I'm starting to agree with you, frankly," he said. "No more Mr. Nice Guy."



In Denver later, he changed his tune when he heard the chant.



"I'll tell you what I'd rather do, honestly, is just beat her on Nov. 8 at the polls. She would be a disaster," he said.



Trump was a punching bag at the Democratic convention in Philadelphia, which wrapped up Thursday night, as speaker after speaker—including some Republicans - said he lacked the temperament to be president.



On Saturday, the GOP nominee replied to the parents of a fallen Muslim-American soldier whose son perished in Iraq.

In a searing speech regarded as one of the highlights of the Democratic convention, Khizr Khan, the father of fallen U.S. Army Capt. Humayun Khan, ripped Trump as having "sacrificed nothing" for the country.

Yet in response to a question from ABC News, Trump replied that "I think I've made a lot of sacrifices. I work very, very hard." He also suggested the Clinton campaign's speechwriters had penned Khan's speech.