The former two-term MA governor told CNN's Jake Tapper that he's spent time in New Hampshire speaking to voters as he readied his 2020 presidential campaign.
"America has a choice", says the narrator of a video announcing Weld's candidacy. "I am ready to lead that fight", he said. While Trump's overall approval ratings have been poor for much of his presidency, he remains popular with Republican voters.
Despite Trump's almost 90% support within the Republican Party, Weld said he is not daunted by the odds.
Failed steak salesman Donald Trump.
Bill Weld announced on April 15, 2019, that he is officially entering the race for president, becoming the first Republican to challenge President Donald Trump in the 2020 race.
The Republican challenger to Trump argued that the president's attacks on North Atlantic Treaty Organisation were unsafe and exactly what Russian President Vladimir Putin couldn't imagine "in his wildest dreams".
Weld said on Monday it would be a "political tragedy", if Trump 2020 re-elected and four more years in office would remain.
Weld said his career as a federal prosecutor stands in stark contrast to the president. "Any effort to challenge the president's nomination is bound to go absolutely nowhere". Weld had 2016 on the side of the presidential candidate of the tiny Libertarian party, Gary Johnson, the Vice presidential candidate. He served as Mitt Romney's co-chair in NY when he ran for president in 2008, but after Romney dropped out, he endorsed Barack Obama for president - not John McCain. Nearly zero, though tight primary races have in the past damaged an incumbent's chances for re-election. Today Weld has made it official.
Fiscally conservative but socially liberal, Weld is known for an unconventional, at times quirky, political style and a long history of friction with the party he now seeks to lead.
This story will be updated as more information becomes available.
Weld said he will not run as an Independent if he does not win the Republican nomination.
Yet his stance on abortion, his advocacy on LGBT issues, and his frequent support for Democrats place him more in the Libertarian than the Republican camp.