The US Secret Service agents, however, immediately scrambled onto the stage and surrounded the Republican presidential candidate at the campaign rally in Dayton, his first public address after the Chicago rally was cancelled due to the protest.
Secret Service agents immediately removed the protester.
Trump was speaking at the rally when he was briefly surrounded by Secret Service agents, who formed a protective barrier around him.
Alleging that the Chicago protest was "planned and "organised" and professionally done, Trump came out in support of his ever increasing supporters by asserting that they did not cause any problem at the Chicago rally.
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"They were taunted, they were harassed by these other people - by the way, some represented Bernie, our communist friend," Trump said.
Referring to the fact that some of the protestors at the Chicago rally were chanting "Bernie, Bernie", Trump urged the Democratic presidential candidate Bernie Sanders to calm down his supporters.
Trump cancelled his campaign rally in Chicago citing security concerns after hundreds of people gathered at the arena to protest against his 'politics of hatred' and scuffled with his supporters in the largest-ever demonstration against the Republican presidential front-runner.
Addressing the massive rally in Dayton, Trump slammed all those who said that he should take responsibility for the unrest at his rallies and tell them to be nicer.
"My people are nice, folks. My people are great," he said amidst loud applause from the supporters.
"We're all together and we want to get along with everybody, but when they have organised, professionally staged wise guys we've got to fight back, we've got to fight back," Trump said.
Meanwhile, In a statement, the Trump Campaign said the Chicago Police Department Commander George Devereux was "informed of everything before it happened".
Likewise, Secret Service and private security firms were consulted and totally involved, it said.
Following the protest and violence at Chicago rally, both
his rivals in the GOP and the opposition Democratic party have slammed him for his "provocative" language at his rallies.
"The person most responsible for what happened in Chicago last night is Donald Trump. Time and again we've watched the Republican front-runner rile up his supporters with calls to violence, sometimes subtle, sometimes explicit, usually directed at minorities, and always un-presidential," said Democratic National Committee Chair Debbie Wasserman Schultz.
Trump's other rivals in the Republican party also slammed him.
"When the candidate urges supporters to engage in physical violence, to punch people in the face, the predictable consequence of that is that is escalates," said Senator Ted Cruz, who is currently running a distant second to Trump in the Republican presidential race.
"I wouldn't say Trump is responsible for the events of last night, but he most certainly in other events has in the past used some pretty rough language and encouraging the crowd, saying things like, "in the good old days we used to beat these people up, or I'll pay your legal bill if you rough them up. So I think he bears some responsibility for the general tone for the things happening," said Marco Rubio, another GOP White House aspirant.
"Tonight the seeds of division that Donald Trump has been sowing this whole campaign finally bore fruit, and it was ugly," he said.