FARNBOROUGH, England July 20 (Reuters) - A bill passed by the U.S. House of Representatives last week to make daylight saving time permanent will face a tough fight in the Senate to win approval, a lawmaker said Monday.

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.