Mark Sanford, the former governor and representative from South Carolina who lost re-election to Congress after becoming a vocal critic of President Trump, announced on Sunday that he would seek the Republican presidential nomination and challenge the man who helped doom his 2018 campaign.
“I am going to get in,” Mr. Sanford said in an interview broadcast on “Fox News Sunday,” ending weeks of speculation about his intentions.
“I think we need to have a conversation on what it means to be a Republican,” he added. “I think that as a Republican Party we have lost our way.”
Mr. Sanford had been mulling a presidential primary run since at least mid-July, when he told The Post and Courier of Charleston, S.C., that he was considering whether and how he could focus national attention on the need to rein in government spending.
On Sunday, he made clear that he would focus his campaign on fiscal issues.
“The epicenter of where I’m coming from is that we have lost our way on debt and deficits and spending,” he said. “The president has called himself the king of debt, has a familiarity and comfort level with debt that I think is ultimately leading us in the wrong direction.”
The federal deficit has ballooned during the Trump presidency and will widen to $1 trillion for the 2020 fiscal year, the Congressional Budget Office said in forecasts released in August.
With his announcement on Sunday, Mr. Sanford, 59, joins the Tea Party Republican and one-term congressman Joe Walsh of Illinois and former Gov. William F. Weld of Massachusetts as Mr. Trump’s primary opponents. Mr. Walsh is seeking to challenge Mr. Trump from the right as Mr. Weld has quietly campaigned from closer to the center. And, now, Mr. Sanford will take on the president from his perch as a budget hawk.
Approval ratings among Republicans for Mr. Trump are consistently in the high 80s. He is virtually guaranteed to win the Republican presidential nomination. But some conservative opponents of Mr. Trump have suggested that the three candidates in combination could hobble him, or at least get under his skin.
For his part, Mr. Trump has boasted about his approval rating and attacked Mr. Sanford, Mr. Walsh and Mr. Weld. The president, who himself has been accused of infidelity, used a tweet last month to make an allusion to Mr. Sanford’s extramarital affair in 2009.
Adding another obstacle for the challengers, several state Republican parties are planning to cancel their presidential primaries next year — including in South Carolina.
Mr. Sanford supported Mr. Trump in 2016 but eventually became one of his fiercest Republican critics in Congress. Last summer, he lost the primary to Katie Arrington, a candidate Mr. Trump had endorsed. Ms. Arrington then lost in the general election to her Democratic opponent, Joe Cunningham.
“Republicans got a wake-up call last week. But will we wake up?” Mr. Sanford wrote in an Op-Ed in The New York Times shortly after Ms. Arrington was defeated. “My party would be wise to take a step back from President Trump’s approach to politics.”
In two stints in the House of Representatives, where he served a total of six terms, Mr. Sanford was regarded as one of the body’s most fiscally conservative members. As governor he went so far as to try to reject $700 million in federal funds sent to his state after the recession in 2009.
His second term as South Carolina governor was marred by the disclosure of the extramarital affair, which he acknowledged following an unexplained and highly publicized disappearance that lasted nearly a week. He had claimed to be hiking the Appalachian Trail, but he instead was in Argentina with his girlfriend.
Despite the scandal, Mr. Sanford won a 2013 special election for the congressional seat he had held before becoming governor.
Annoyed by the criticism from Mr. Sanford, Mr. Trump unleashed a Twitter attack hours before the polls closed on the day of Mr. Sanford’s primary in 2018.
“Mark Sanford has been very unhelpful to me in my campaign to MAGA,” Mr. Trump wrote, referring to his “Make America Great Again” campaign slogan. “He is MIA and nothing but trouble. He is better off in Argentina.”
The tweet helped seal Mr. Sanford’s defeat.