The recent perceived political evolution of Sen. John Fetterman (D-PA) has been a sight to behold, as he has disassociated himself from progressive leftists, expressed staunch support for Israel against Hamas, called for tougher border security to reduce illegal immigration, and demanded a corrupt and indicted Democratic colleague resign or be expelled in shame.

All of that and more may have contributed to Fetterman being verbally attacked and heckled earlier this week by anti-Israel leftist protesters, according to The Western Journal.

The Democratic Pennsylvania senator appeared to be completely unfazed by the protesters' attempt to shout him down as he renewed his unequivocal condemnation of the Hamas terror group and support for Israel as it continues its military response to Hamas' murderous Oct. 7 terror attacks in southern Israel.

Fetterman trolls anti-Israel protesters

On Thursday, Sen. Fetterman briefly spoke with Daily Caller reporter Jennie Taer, who asked him if he believed his Democratic colleagues should be pressured to publicly condemn Hamas as a terrorist organization.

"Well, anyone, everyone should be condemning Hamas," he replied. "I don't know why U.N. hasn't condemned Hamas."

Fetterman was unable to continue with his response to the reporter, however, as a group of anti-Israel protesters standing nearby began to talk and shout over him with allegations and dubious counterpoints about alleged Israeli atrocities and "genocide" committed against "Palestinian children," which prompted the senator to reiterate that "Hamas should be condemned" as he turned and walked away.

WATCH: Pro-Palestinian protesters shouted down Democratic Sen. John Fetterman of Pennsylvania on Thursday after he maintained that Hamas should be condemned for the Oct. 7 terrorist attack against Israel.@DailyCaller pic.twitter.com/YTlH7XLvH7

— Jennie Taer 🇮🇱🇺🇸 (@JennieSTaer) December 14, 2023

His apparent dismissal of the claims from anti-Israel protesters was reminiscent of an incident just about a month ago when Fetterman, with an apparent trollish smile, waved a small Israeli flag as he walked past a group of anti-Israel protesters being arrested outside the Capitol building.

Pennsylvania senator John Fetterman, a Democrat, has angered many on the left after he waved an Israeli flag by anti-Israel protesters who were being arrested at the U.S. Capitol. pic.twitter.com/z8u9gfkY2E

— Andy Ngô 🏳️‍🌈 (@MrAndyNgo) November 10, 2023

"I'm not a progressive," Fetterman clarifies

On Friday, NBC News reported that the perceived shift of Sen. Fetterman took a somewhat unexpected turn when he clearly disassociated himself with the progressive leftist wing of the Democratic Party that he had previously been lumped in with due to his prior support for the presidential run by socialist Sen. Bernie Sanders (I-VT) and his left-leaning populist stance on various issues.

Yet, his break with leftist progressivism, if only on some issues, had already become evident in recent months by way of his unswayable support for Israel against Hamas, his call for fellow Democrats to get tougher on border security and illegal immigration, and his persistent demand that criminally indicted Sen. Bob Menendez (D-NJ) resign or be forced out of office.

"I’m not a progressive," Fetterman told NBC. "I just think I’m a Democrat that is very committed to choice and other things. But with Israel, I’m going to be on the right side of that. And immigration is something near and dear to me, and I think we do have to effectively address it as well."

"It’s a reasonable conversation -- until somebody can say there’s an explanation on what we can do when 270,000 people are being encountered on the border, not including the ones, of course, that we don’t know about," the senator continued. "To put that in reference, that is essentially the size of Pittsburgh, the second-largest city in Pennsylvania."

As for Menendez, who has proclaimed his innocence and refused to resign, Fetterman told NBC, "He needs to go. I don’t understand why he can be here, having expelled Santos," in reference to ex-Rep. George Santos (R-NY), and added, "But I’m sure there might be a very innocent explanation of having gold bars in your mattress and overstuffed envelopes of cash," in reference to the alleged bribes the New Jersey senator received in exchange for using his political influence to benefit the Egyptian government.