They can and will impeach him again. Remember that the only reason why the first one did not go through was because the Republicans voted against even hearing witness testimonies in the senate.
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https://www.reuters.com/article/us-...clearing-way-for-acquittal-idUSKBN1ZU1D2?il=0
By a vote of 51-49, the Republican-controlled Senate stopped Democrats’ drive to hear testimony from witnesses like former national security adviser John Bolton, who is thought to have first-hand knowledge of Trump’s efforts to pressure Ukraine to investigate a political rival, former Vice President Joe Biden.
Those actions prompted the Democratic-controlled House of Representatives to formally charge Trump with abuse of power and obstruction of Congress in December, making Trump only the third president in U.S. history to be impeached.
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Even @ today the Republican senate leader Mitch McConnell is uncertain how he will vote. A report in the New York Times and another source have confirmed that Mitch wants to turn a new page and make it a post Trump era. He can't do that with Trump hogging the spotlight for the next 4 years.
Meanwhile even Fox News are divided. Trump has lost many once loyal supporters.