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President Donald Trump ain't happy that ABC put Jimmy Kimmel back on air ... and let everyone know by ripping into the "fake news" network Tuesday night.

Check out his post on Truth Social -- he says he "can't believe" Jimmy's suspension was lifted, theorizing ... "Something happened between then and now because his audience is GONE, and his 'talent' was never there."

The prez goes on to question why ABC would want someone "who does so poorly, who’s not funny, and who puts the Network in jeopardy by playing 99% positive Democrat GARBAGE" back on air.

He further accuses Jimmy of being "another arm" of the Democratic National Committee, and claims that's illegal. Getty

DT then threatens to sue ABC and wraps up his rant by calling them "a true bunch of losers."

Trump

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