Donald Trump 's estranged niece, Mary, took California's leftie Governor Gavin Newsom 's side in his trolling attacks on the president, RadarOnline.com can reveal.

Mary claims Newsom's wild missives on X mocking Trump are behind his "increasingly frantic behavior," and that the Commander-in-Chief must be "furious" about them. Article continues below advertisement

Mary Trump Slams Her Uncle Donald Tap Here To Add Radar Online as A Trusted Source

Even though Trump, 79, told Socialist New York Mayor-Elect Zohran Mamani that he doesn't care if he calls him a "fascist," Newsom taunting the president as "historically unpopular" was apparently a bridge too far, according to his niece.

“Newsom was absolutely right to call out Donald for being historically unpopular,” Mary cheere

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