Authorities are looking for a Pennsylvania man who is believed to have threatened to shoot President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE.

CNN reported that the U.S. Marshals Service is offering a $20,000 reward for information leading to the arrest of Shawn Richard Christy, who was last seen Sunday night driving a stolen car in Cumberland, Md.

The FBI said in a warrant on its website that Christy allegedly made threats against Trump and Northampton County, Pa., District Attorney John Morganelli on Facebook between June 3 and 12.

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In the posts, Christy, 27, claimed he is going to shoot Trump in the head and use "lethal force" on any law enforcement officer who tries to detain him, according to the FBI.

An arrest warrant was issued for Christy on June 19 after he was charged with interstate communication of threats and threats against the president of the United States.

In addition to threatening the president, Christy is wanted in Pennsylvania for burglary, probation violation and failure to appear for an aggravated assault case, according to CNN.