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In a statement earlier this month, Blackburn heralded Thatcher as "one of the greatest conservative leaders our generation has known."

"She cast away barriers and convinced people to open their minds to the ideals and concepts of freedom, free people and free markets," Blackburn said. "Lady Thatcher will be remembered for her friendship to America and the alliance she helped forge with President Ronald Reagan to bring peace and prosperity to people around the world."

The House members will be flying commercial to the funeral, BoehnerJohn Andrew BoehnerDems face hard choice for State of the Union response Even some conservatives seem open to return to earmarks Overnight Finance: Trump, lawmakers take key step to immigration deal | Trump urges Congress to bring back earmarks | Tax law poised to create windfall for states | Trump to attend Davos | Dimon walks back bitcoin criticism MORE said, as part of a House directive restricting military travel during sequestration.

The White House has not yet announced who plans to attend the funeral, although President Obama and the four living former presidents have all been invited. Former House Speaker Newt Gingrich is also planning to attend, as is Queen Elizabeth — her first appearance at a prime minister's funeral since Winston Churchill died in 1965.