President Trump publicly pressured Sen. Tom Cotton on Saturday to support legislation making daylight saving time permanent, even posting the Arkansas Republican’s cellphone number and urging voters to contact him.

Trump made the demand in a Truth Social post as he called on the Senate to advance the Sunshine Protection Act, which would end the twice-yearly practice of changing clocks and establish daylight saving time as the permanent standard.

“Tom Cotton, a friend of mine, is holding up a very important Bill,” Trump wrote, arguing that the measure should receive broad bipartisan support. He then directed Arkansas residents to contact Cotton and included the senator’s cellphone number in the post.

The legislation passed the House in July by a 308-117 vote, with 193 Republicans, 114 Democrats and one independent voting in favor. It was subsequently sent to the Senate, where it has not advanced.

Cotton has opposed making daylight saving time permanent, raising concerns about darker winter mornings for children traveling to school and Americans commuting to work.

The Arkansas senator has argued that keeping daylight saving time year-round would leave many Americans without sunlight during the early morning hours in winter. Other lawmakers have raised similar concerns about the effects of later winter sunrises.

Trump has taken the opposite position, arguing that Americans would benefit from having more daylight during the afternoon and evening. In his post, he pointed to outdoor activities including golf, tennis and hunting, as well as agriculture.

Trump also highlighted support from PGA Tour CEO Brian Rolapp, who sent a letter backing the legislation. The president argued that additional afternoon daylight would help the PGA Tour finish tournaments.

The Sunshine Protection Act has been under consideration in Congress for years. The current version, H.R. 139, was introduced in 2025 and would make daylight saving time permanent across most of the country while preserving existing exemptions for areas that do not observe it.

Senate passage would require the measure to clear the chamber before it could reach Trump's desk. Senate Majority Leader John Thune has previously expressed uncertainty about whether the bill has enough support to advance.

Cotton's office had not immediately responded to requests for comment on Trump's post.