By ANNE FLAHERTY and KIMBERLY HEFLING, Associated Press Writers

WASHINGTON - Republicans increasingly are backing a new approach in the Iraq war that could become the party's mantra come September. It would mean narrowly limited missions for U.S. troops in Iraq but let President Bush decide when troops should leave.

So far, the idea has not attracted the attention of Democratic leaders. They are under substantial pressure by anti-war groups to consider only legislation that orders troops from Iraq.

But the GOP approach quickly is becoming the attractive alternative for Republican lawmakers who want to challenge Bush on the unpopular war without backtracking from their past assertions that it would be disastrous to set deadlines for troop withdrawals.

"This is a necessary adjustment in the national debate to reintroduce bipartisanship, to stop the `gotcha' politics that are going on that seem to be driven by fringes on both sides and change the terms of the discussion," said Rep. Phil English, R-Pa.

English is among the more than 40 Republicans in the House and Senate who are sponsoring legislation intended to shift the mission of U.S. troops. Several other GOP lawmakers, facing tight elections next year and a strong anti-war sentiment in their districts, say they are considering this approach.