He's thrown his hat into the ring for president before.
And now he's ready for round two -- this time, challenging President Donald Trump.
Bill Weld, Massachusetts' former Republican governor, announced on Friday he has formed an exploratory committee to enter the 2020 race for the White House.
His announcement marks the first time a Republican has jumped in to officially challenge Trump, who is seeking re-election.
Weld says he plans to run because the country is in quote "grave peril." He's criticizing Trump, saying he's serving himself rather than the nation, he's too unstable to carry out his presidential duties and that he's generating chaos.
Weld ran on the Libertarian Party's presidential ticket in 2016 before returning to the Republican party this year.
The 73-year-old is a former prosecutor and was governor of Massachusetts from 1991 to 1997.
President Donald Trump on Wednesday will sign an executive order designed to protect free speech on college campuses. Trump was urged to do this by conservative youth advocacy group Turning Point USA..