CNN senior political analyst David Gergen late Saturday said President Trump delivered “the most divisive speech I’ve ever heard from a sitting American president” at a campaign-style rally in Pennsylvania.

"To bring your campaign speech into the presidency is something presidents rarely do," Gergen said on CNN.

"He played to his base and he treated his other listeners, the rest of the people who have been disturbed about him or oppose him, he treated them basically as 'I don't care, I don't give a damn what you think, because you're frankly like the enemy.'"

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Gergen, who has advised four U.S. presidents, said he found Trump’s speech “deeply disturbing.”

Trump held a freewheeling rally in Harrisburg, Pa., late Saturday to celebrate his 100th day in office.

Trump basked in the roars of the crowd as he touted his accomplishments and reiterated his commitment to campaign promises such as repealing ObamaCare and building a wall on the U.S.-Mexico border.

Trump also accused Democrats of obstructing his agenda, taking aim at Senate Minority Leader Charles Schumer Chuck SchumerPelosi orders Capitol flags at half-staff to honor Ginsburg Ginsburg in statement before her death said she wished not to be replaced until next president is sworn in Democrats call for NRA Foundation to be prohibited from receiving donations from federal employees MORE (D-N.Y.).

"Sen. Schumer is bad leader," Trump said. "I've known him a long time. Sen. Schumer is a bad leader. Not a natural leader at all. He works hard to study leadership. When you have to study leadership, you've got problems.

"Sen. Schumer is weak on crime and wants to raise your taxes through the roof. He is a poor leader — known him a long time — and he's leading the Democrats to doom."

Trump also criticized coverage of his first 100 days in office at the rally, held on the same night as the annual, star-studded White House Correspondents' Association dinner in Washington.

"I could not possibly be more thrilled than to be more than 100 miles away from Washington's swamp, spending my evening with all of you and with a much, much larger crowd and much better people," Trump said.