Oklahoma Sen. James Lankford (R) is joining calls for President Trump to release his tax returns, saying Trump should "keep his promise."

"[Trump] promised he would," Lankford said at a town hall Tuesday night in Claremore, Okla., when asked whether the president should share his tax returns, according to the Tulsa World.

"He should keep his promise," he added.

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Calls for the president to release his tax returns were constant during the campaign and have picked up this week in light of Tax Day on Tuesday.

Last Saturday, tens of thousands of protesters joined tax marches across the country demanding that Trump release his tax returns. And on Tuesday, a chorus of lawmakers called on Trump to share his tax documents.

Trump said in 2014 and 2015 that he would release his returns but has since walked back that promise, claiming that an audit has prevented him from sharing the documents with the public.