The U.S.-backed Board of Peace briefed senior national security advisers and staff for House and Senate Republican and Democrat leaders on Monday about “the Roadmap and the current state of implementation with Israel and Hamas,” a board official said.National security advisers for Senate Majority Leader John Thune (R-S.D.), Senate Minority Leader Chuck Schumer (D-N.Y.), House Speaker Mike Johnson (R-La.) and House Minority Leader Hakeem Jeffries…