"These debates should be very easy when we meet who we meet," he said.
The rally in central Pennsylvania, a key battle state, highlights Trump's commitment to campaigning in areas that have shown signs of alert for his re-election campaign. Trump foreshadowed that he will be back here a little next year.
"I will be seeing many of you next year … I have to win this state," he said.
Trump hopes the rallies will be part of the solution to reinforce his support. Frustrated with the surge in television news coverage that Democratic presidential candidates are drawing, Trump is trying to put the spotlight back on his campaign.
The Trump campaign is now eyeing a set of rallies next month to kick off Trump's re-election campaign, a source close to the CNN campaign said.
The president arrived in Pennsylvania just two days after former Vice President Joe Biden rallied supporters in Philadelphia, giving his candidacy for the Democratic nomination in terms of his ability to defeat Trump in a general election.
"We think we're doing very well in Pennsylvania, we won last time, polls made us miss last time in Pennsylvania and we won," Trump said when asked about reporters' research on Monday.
Beyond Pennsylvania, Trump is wanting to boost his campaign for next month, ahead of early Democratic debates.
Trump campaign aides are also finalizing plans for a series of demonstrations beginning June 16, the anniversary of the launch of Trump's 2016 campaign, the source said. Trump's re-election campaign has been in place since his first day in office and he has held campaign rallies since the beginning of his term, but campaign advisers note that Trump has yet to hold a formal rally. Axios first reported plans for the launch of the campaign.
Advisers expect Trump to become more anxious as he watches the Democrats take over their television. He has already begun publicly disclosing some of those complaints, tweeting on Sunday to complain to Fox News City Hall with Pete Buttigieg, the mayor of South Bend, Indiana, and Democrat presidential candidate in 2020.
The campaign is also debating ways to counter-program the Democratic debates that will begin shortly, looking at the possibility of hastening Trump rallies, including potentially hosting some in the same city as the debates.
Trump's Monday rally came on the eve of a special election for Pennsylvania's 12th Congressional District, a conservative fortress where Trump expects Fred Keller to hold the position in Republican hands.
CNN's Kaitlan Collins and Sarah Westwood contributed to this report.