Gardner confirmed his stance in a statement to Colorado Politics on Wednesday.
The electorally vulnerable senator, who is up for reelection in 2020, had been viewed as a potential “yes” vote on the issue. Four Republicans would have to side with Senate Democrats to reach the 51 votes needed to call witnesses.
With Gardner out, that leaves Sens. Susan Collins (Maine), Mitt Romney (Utah) and Lisa Murkowski (Alaska) as the most likely remaining Republican “yes” votes.
“I do not believe we need to hear from an 18th witness,” the Colorado Republican told Colorado Politics in a statement. “I have approached every aspect of this grave constitutional duty with the respect and attention required by law, and have reached this decision after carefully weighing the House managers and defense arguments and closely reviewing the evidence from the House, which included well over 100 hours of testimony from 17 witnesses.”
And Gardner’s opponents are hammering him:
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