Leading House Republicans raised the prospect that they might refuse to participate in President Obama's proposed healthcare summit if the White House chooses not to scrap the existing reform bills and start over. In a letter to White House Chief of Staff Rahm Emanuel, House Minority Leader John A. Boehner and Minority Whip Eric Cantor expressed frustration at reports that Obama intends to put the Democratic bills on the table for discussion at the Feb. 25 summit, the Washington Post reports.