Republican US senator: I'm open to subpoena of Trump's taxes

PORTLAND, Maine (AP) — U.S. Sen. Susan Collins said today she's open to using a subpoena to investigate President Donald Trump's tax returns for potential connections to Russia.

Collins, a Republican who has served as a U.S. senator from Maine since 1997, sits on the Senate Intelligence Committee, which is investigating Russian interference in the 2016 election. She appeared on Maine Public radio to talk about issues including the investigation.

Collins was asked if the committee would subpoena Trump, who's also a Republican. She said she hopes for "voluntary cooperation" but is open to using a subpoena if necessary.

"This is a counter-intelligence operation in many ways. That's what our committee specializes in," she said during the radio appearance. "We are used to probing in depth in this area."

Trump's refusal to disclose his tax returns is a break with presidential tradition. He has said he would be happy to release them after the completion of an Internal Revenue Service audit.

Using a subpoena to get access to the tax returns would be a more aggressive move than members of Congress have taken on the subject so far. House and Senate leaders have thus far shown no interest in taking such a step.