Sen. Tom CottonTom CottonGOP senator: Pence ‘deserved better treatment’ at Notre Dame Congress should let local communities set their own PACE GOP talks of narrowing ‘blue-slip’ rule for judges MORE faced a combative town hall audience on Monday when he defended President Trump's decision not to release his tax returns. 

The Arkansas Republican was loudly booed during an event in Little Rock when asked if he would back forcing Trump to release the documents, so voters could see if the president has any ties to foreign government. 
 
"As far as I'm aware the president says he's still under audit," Cotton said. 
 
He added that "the president is also right that this was not a secondary or side issue of the campaign, this was a central issue of the campaign ... and he won this fight already." 
 
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Several constituents held up red cards indicating that they disagree.
 
Thousands of people turned out across the country over the weekend to demand that Trump release his tax returns, after he broke decades of presidential tradition by refusing to make them public. 
 
Trump said during the campaign it was due to an audit, but the IRS said that did not legally prevent him from releasing the documents. Once he took office, the White House said he had no plans to release them.
 
Democrats continue to push for Trump to release the documents, speculating that it could show ties to Russia. 
 
Senate Minority Leader Chuck SchumerCharles SchumerCongress urges Trump administration to release public transit funding Overnight Tech: FCC begins rolling back net neutrality | Sinclair deal puts heat on regulators | China blames US for 'Wanna Cry' attack Sasse dominates Twitter with Schumer photo, 'reefer' caption MORE (D-N.Y.) said last week that it would be harder to do tax reform if Trump doesn't release the documents, because lawmakers won't know if he's proposing cuts that would benefit himself. 
 
But Cotton added on Monday that there were other ways to figure out if Trump has tied to countries overseas, including a financial disclosure form that Trump has to fill out. 
 
"Second, it doesn't take a lot of effort to find out where Donald TrumpDonald TrumpPoll: More people view NATO favorably EPA chief jabs California’s environment push David Letterman: ‘Makes me sick’ that Trump represents us MORE has connections overseas. He normally puts his name on buildings where he has them," he said.