That cone of silence has fueled speculation that Amash will join former Govs. Bill Weld and former Rep. Joe Walsh in formally challenging President Trump. And it has supercharged outside efforts to get him in the race. Several officials in the Libertarian Party, which would be the most logical vehicle for an Amash presidential run, told The Daily Beast they have been reaching out to the congressman’s camp to indicate that he’d have strong support among the activists who decide the party’s presidential nomination.

Those who know Amash say he may be waiting on two things before making a decision: a clearer sense of Libertarian Party support, and a clearer statement of plans from another rumored Trump challenger: his former House colleague Mark Sanford. The South Carolina Republican, who served as governor and a member of Congress before losing his seat last cycle, has not yet officially launched a bid but is considered likely to challenge Trump in the GOP primary.

The Daily Beast spoke with six people who either know Amash personally or have worked with him, three of whom requested anonymity to speak candidly about what his plans may be. One of them said that the congressman is almost certainly waiting to see if Sanford will run, and that he would not run himself if his old friend were to get in the race.