Drake, 50, allegedly tweeted late Tuesday he "will be buying an AR-15 tomorrow, because if you impeach MY PRESIDENT this way, YOU WILL HAVE ANOTHER CIVAL (sic) WAR!!! #MAGA2020."
Both tweets and Drake's Twitter account have since been deleted.
Drake did not respond to ABC News for comment.
The MLB's Umpire Association appeared to stand by Drake, calling him "a passionate individual and an outstanding umpire."
"He chose the wrong way to convey his opinion about our great country. His posting does not represent the view of the MLBUA or reflect those of the umpires we represent," the statement read. "The MLBUA supports all of the umpires who ensure fair play in the greatest game on earth. We are a group of individuals with diverse opinions and beliefs, united in our desire to continue our excellence officiating MLB games."
Drake has been with MLB since 2010, according to his umpire profile. He is also the co-founder of Calling for Christ, a ministry of umpires in Major and Minor League Baseball, his profile reads.