Outgoing 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.) told NBC News that there are no seeming consequences for President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE when he lies, cautioning that there would be "incredibly harmful" repercussions in Washington's future.

"There is no seeming consequence to the president and lies and it is going to have incredibly harmful consequences in the way that we operate going forward, based on the construct of the Founding Fathers," Sanford said in an interview with NBC's "Meet the Press," which is set to air on Sunday.

WATCH: Rep. @MarkSanford (R-S.C.), who lost his primary race Tuesday, joins #MTP in an exclusive interview and says GOP leaders are “running for the hills” instead of challenging the president. Catch more of his interview this Sunday on Meet the Press. #ifitsSunday pic.twitter.com/dMnKtE2DV4 — Meet the Press (@MeetThePress) June 15, 2018

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Sanford, a frequent Trump critic, lost his bid for reelection this week in Tuesday's South Carolina primary, falling to state Rep. Katie Arrington.

Arrington, who secured Trump's endorsement in a last-minute tweet on Tuesday, had closely aligned herself with the president, calling the GOP the "party of President Donald J. Trump" in her victory speech.

Sanford has escalated his attacks against the president and GOP lawmakers aligned with Trump since his defeat.

The outgoing congressman told MSNBC this week that he pledges allegiance to the flag, not Trump.

"We swear an allegiance to the Constitution and we pledge allegiance to the flag and what was weird about this race that I've never experienced before in any race I've been a part of was an allegiance question where people say are you for or against the president," Sanford said on "Morning Joe."

Sanford also likened GOP support for Trump to a "cancerous growth" in the party in an interview with Rolling Stone magazine.

Sanford has attributed part of his defeat to his publicly perceived lack of loyalty to the president.

Asked why more Republicans haven't spoken out against Trump, Sanford said, "People are running for the hills. And again everybody, what you do as an elected official is, an old-time senator told me years ago, the name of the game is staying in the game."