Former Massachusetts Gov. Bill Weld William (Bill) WeldRalph Gants, chief justice of Massachusetts supreme court, dies at 65 The Hill's Campaign Report: Biden visits Kenosha | Trump's double-voting suggestion draws fire | Facebook clamps down on election ads Biden picks up endorsements from nearly 100 Republicans MORE, the first Republican to mount a primary campaign against President Trump, said on Sunday that he's "thrilled" more Republicans are joining the 2020 race.

Former Rep. Joe Walsh (R-Ill.) announced his presidential campaign Sunday, and former Rep. Mark Sanford Mark SanfordOn The Money: Business world braces for blue sweep | Federal Reserve chief to outline plans for inflation, economy | Meadows 'not optimistic' about stalemate on coronavirus deal Trump critic Sanford forms anti-debt advocacy group Republicans officially renominate Trump for president MORE (R-S.C.) has been mulling a potential White House bid.

"I'm thrilled about Joe Walsh and Mark Sanford getting in, I think that's terrific," Weld said on NBC's "Meet the Press."

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Weld said that more GOP candidates will lead to a "more robust conversation" that he said would benefit the country.

"And who knows? The networks might even cover a Republican primary debate," he said.

Weld also encouraged more Republicans to launch a primary campaign against the president.

"We need to assemble rational people. Sure a crazed president makes the stock market go down, but that doesn't mean we have to like it," Weld said.

WATCH: GOP Presidential challenger Bill Weld re-electing President Trump would mean "four years of unadulterated, unrequited payback" #MTP #IfItsSunday@govbillweld: "I'm thrilled about Joe Walsh and Mark Sanford getting in" the 2020 Republican race. pic.twitter.com/sdeinIKOtj — Meet the Press (@MeetThePress) August 25, 2019

Weld, citing former White House adviser Steve Bannon Stephen (Steve) Kevin BannonDemocrats' cowardice must end: It's time to teach the GOP a lesson Juan Williams: Swamp creature at the White House Engineers say privately funded border wall is poorly constructed and set to fail: report MORE, said Trump's vision for a second term would mean "four years of unadulterated, unrequited payback."

"Pay back for what? It's another example of his extreme, malignant narcissism. He's only happy when other people are losing," Weld said.

Trump, however, still has the overwhelming support from his party. A RealClearPolitics average has Trump polling at 81.3 percent. Weld has just 9.3 percent of GOP support, based on the average of recent polls.