In 2012, Gallup surveyed Americans about their perceptions of presidential candidates and 45% perceived Mitt Romney as conservative, 29% as moderate, and 12% as liberal with 14% having no opinion about his ideology. In 2016, Romney considered endorsing and voting for the Libertarian Party's presidential ticket. Romney announced that he did not plan to make an endorsement for President in 2020. He was one of three Republican Senators, the others being Lisa Murkowski of Alaska and Susan Collins of Maine, who refused to co-sponsor a resolution opposing the impeachment inquiry into President Trump. He was one of two Republicans voting with Democrats to allow witnesses during the impeachment trial, being disinvited from CPAC as a result. In February 2020, he became the sole Republican to vote in favor of convicting President Trump under the first article of impeachment. In the US Senate, as of November 2020, Romney had voted with President Trump on legislative issues about 82% of the time.