Washington (CNN) GOP Sen. Cory Gardner on Thursday dodged a 'yes or no' question on whether it was appropriate for President Donald Trump to ask a foreign leader to investigate a political rival with the Colorado Republican refusing to answer at least five times when asked.

"Well look, this is what we're going to get into," Gardner said when pressed by reporters. "The Senate Intelligence Committee is having an investigation, a bipartisan investigation. Unfortunately, though, what we've seen is a very political process take over."

Adding when asked again, "It's an answer that you get from a very serious investigation."

Gardner is one of the most vulnerable GOP senators up for reelection in 2020 and is among other Republican lawmakers who have hesitated to say if it was wrong for Trump to ask China and Ukraine to investigate former Vice President Joe Biden and his son. Trump's actions, including his statement on the south lawn of the White House earlier this month that Ukraine and China should investigate the Bidens, are at the helm of an escalating Democratic-led impeachment inquiry

There is no evidence of wrongdoing by either Joe or Hunter Biden.

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