Senator John Kennedy, a Republican, said President Donald Trump called him recently to ask him to support the bill to end the twice-yearly practice of changing clocks that has been ​observed across most of the United States since the 1960s.

Kennedy said he agreed ​to support it but said there is significant opposition in the Senate. "It's ⁠going to be a dog fight," Kennedy told reporters on the sidelines of the ​Farnborough air show.

Senator Jeanne Shaheen, a New Hampshire Democrat who is part of a U.S. ​delegation at the show, expressed mixed feelings. "I feel it every time we change the clocks," Shaheen said, noting the change would result in "putting kids on the bus in the elementary school when it's still ​dark in the morning. I appreciate the safety concerns."

Last week, Senate Majority Leader ​John Thune said it was unclear whether the daylight saving bill could garner the 60 votes needed ‌for ⁠passage in the chamber.

If enacted, clocks would no longer return to standard time in November, although states could opt out of year-round daylight saving time if they do not currently observe it.

Supporters say changing clocks disrupts sleep, increases workplace injuries and contributes to ​more road accidents. They ​argue keeping clocks ⁠an hour ahead year-round would provide more evening daylight and boost economic activity during the winter months.

Critics note the change would mean ​the sun rises an hour later on winter mornings, leaving more ​children traveling ⁠to school and commuters, construction workers, farmers and others heading to work before daylight. In some places the sun would not rise until nearly 9 a.m. or later at the height ⁠of ​winter.

The U.S. used year-round daylight saving time during World ​War Two and enacted it again in 1974 to reduce energy use. But it proved deeply unpopular and Congress ​repealed it later that year.