Montana Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE (D) said on Thursday that the country's founders would not tolerate President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE asking Ukraine to investigate former Vice President Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE ahead of the 2020 presidential campaign.

“I just think that if in fact that president did ask a foreign country to come in [and investigate a political rival], and influence our elections, I don’t think the forefathers would have tolerated that," Tester told The Hill's editor-at-large Steve Clemons at "America's Veterans: The Next Mission," which was sponsored by Wells Fargo.

“So it just says to me that if there’s there-there, we need to react appropriately," he continued.

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Tester said he's talked a little bit with his Republican colleagues in the upper chamber since the impeachment hearings, but added that communication was "pretty clammed up.”

Tester's Republican colleague, Sen. Todd Young Todd Christopher YoungSenate GOP eyes early exit Why the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump MORE (Indiana), was also present at the event and spoke in a separate panel.

“I’m uncomfortable looking at this through a political lens as you might expect," Young told The Hill's editor-in-chief Bob Cusack Robert (Bob) CusackThe Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's 12:30 Report - Presented by Facebook - Big 10 votes to resume football season MORE.

"So I’m going to let the House do their business," he continued. "I wish they’d do more business quite frankly. You have one committee focused on impeachment, others could be focused on USMCA, higher education act reauthorization and so forth, but it is what it is.”

House Democrats are investigating Trump's push for Ukraine to investigate Biden and his son, Hunter Biden.

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The remarks came one day after the first days of public testimony in the House's impeachment inquiry.

The top U.S. diplomat in Ukraine, William Taylor, revealed in his testimony that U.S. Ambassador to the European Union Gordon Sondland Gordon SondlandGOP chairman vows to protect whistleblowers following Vindman retirement over 'bullying' Top Democrat slams Trump's new EU envoy: Not 'a political donor's part-time job' Trump names new EU envoy, filling post left vacant by impeachment witness Sondland MORE told a member of his staff that Trump cared more about an investigation into Biden than he did about Ukraine.

Trump has repeatedly slammed the inquiry as a partisan "witchhunt."