South Carolina 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) is warning that "dissenting voices are quashed" under 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, blaming the president's attacks and his opponent's charges of disloyalty to the president for his surprise primary defeat last week.

In a Friday op-ed for The Washington Post, Sanford remarked that the president has taken demands for loyalty from lawmakers "to a new level."

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"I wasn’t Trump enough in the age of Trump — and so indeed I lost," Sanford wrote.

"We should all be alarmed when dissenting voices are quashed," he added. "President Trump is not the first executive to want compliance from a legislative body, but he has taken it to a new level. This is more than a problem; it’s a challenge to one of the most basic of American tenets — that we can agree to disagree."

Sanford, the state's former governor who had never lost an election before Tuesday's race, was hammered by his opponent state Rep. Katie Arrington (R) over what she suggested was insufficient support of the president. Sanford has criticized Trump's policies, although he says he votes with Trump the majority of the time.

In the hours before the primary, Trump waded into the race personally, endorsing Arrington over Sanford.

"Mark Sanford has been very unhelpful to me in my campaign to [make American great again]. He is MIA and nothing but trouble. He is better off in Argentina," Trump wrote on Twitter June 12, just hours before Sanford would concede.

"I fully endorse Katie Arrington for Congress in SC, a state I love. She is tough on crime and will continue our fight to lower taxes. VOTE Katie!"

Sanford wrote in his op-ed that Trump's endorsement of his opponent, and subsequently mocking him at a House Republican dinner in Washington, was the result of a "collective amnesia" affecting Americans that makes voters not care about dishonesty from elected officials such as Trump.

"We have become so desensitized to the president’s tortured relationship with the truth that we don’t challenge the inaccurate things he and others say. There should be a consequence to making things up," Sanford argued.

"But inexplicably, as a society, we have somehow fallen into a collective amnesia in thinking that it doesn’t matter when the highest officeholder in the land doesn’t tell the truth."

Sanford defended his record in his concession speech, adding that he would oppose the president again if Trump conflicted with conservative ideals.

"It may have cost me an election in this case, but I stand by every one of those decisions to disagree with the president because I didn't think, at the end of the day, it was concurrent with the promises I made when i first ran for office or the voices of the very people of the 1st District," he said.