Rep. Mark Sanford (R-S.C.) on Wednesday said it would be a "grave mistake" for President-elect Donald Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE to think that only reporters care about whether he makes his tax returns public.

"I care — or more aptly said, I still care," Sanford said in a statement. "I cared five months ago when I wrote an op-ed published in The New York Times on this very issue. And I care now because the consequences of not doing so will echo into future campaigns."

During his press conference Wednesday, Trump said that "the only ones who care about my tax returns are reporters."

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The president-elect reiterated that he isn't releasing his tax returns because the IRS is auditing him. However, the IRS has said that nothing prevents people from releasing their own tax information.

Sanford said he wants Trump to release his tax returns because doing so encourages transparency and is tradition for presidential candidates.

"Refusing to release his tax returns now will likely lead to much the same from future presidential candidates, and I predict that a trickle-down effect will occur where down-ballot candidates won’t feel pressured to do so either," he said. “If President-elect Trump wants us to take him at his word, then certainly he should hold true to his former promises to make his tax returns public.”

In the last Congress, Sanford was a co-sponsor of legislation that would require major-party presidential nominees to release their three most recent years of tax returns.

A sponsor of the upper chamber version of the bill, Sen. Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (D-Ore.), asked his Twitter followers Wednesday to retweet him if they care about Trump's tax returns. There were 35,000 people who had retweeted Wyden as of Wednesday afternoon.