Amash, a five-term congressman who left the GOP last year amid disagreements with Trump, announced last week that he is exploring a bid for the Libertarian presidential nomination, arguing that voters deserve an option other than Biden or Trump.

Amash received only 5 percent support in the Monmouth poll. But Patrick Murray, the director of the Monmouth University Polling Institute, said that if the presidential race is as close as it was in 2016, when Trump beat Democrat Hillary Clinton in the Electoral College, the presence of a third-party candidate on the ballot, like Amash, could prove pivotal.