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The revelation that Trump pushed for the probe into the Bidens is at the center of a House impeachment inquiry.

The president has denied wrongdoing and has publicly asked Ukraine and China to investigate the former vice president. Romney also called this move "wrong and appalling."

Trump in a tweet last month called Romney "pompous."

I’m hearing that the Great People of Utah are considering their vote for their Pompous Senator, Mitt Romney, to be a big mistake. I agree! He is a fool who is playing right into the hands of the Do Nothing Democrats! #IMPEACHMITTROMNEY — Donald J. Trump (@realDonaldTrump) October 5, 2019

Trump Jr.'s book, "Triggered: How the Left Thrives on Hate and Wants to Silence Us," was released on Tuesday and already sits on the Amazon bestsellers list.

— Joe Concha contributed to this report, which was updated at 10:24 a.m.