President Bush's longtime political adviser, Karl Rove, has announced his resignation set for the end of the month.
Speaking at the White House Monday Mr. Bush thanked Rove and his family for the sacrifices they have made.
Rove said his service has been a joy and an honor of a lifetime.
In an interview published in "The Wall Street Journal" today, Rove said he is resigning, in his words, "for the sake of my family."
Rove was considered the architect of President Bush's election victories in 2000 and 2004, and was one of the president's most influential advisers.
Considered a ruthless political warrior, Rove was involved in a number of controversies. Retired U.S. diplomat Joseph Wilson claimed Rove illegally leaked the identity of his wife Valerie Plame , a CIA operative, for political reasons. Rove has never been charged with wrongdoing.
Last month, the U.S. Senate Judiciary Committee issued subpoenas for Rove as part of an investigation into the firings of several federal prosecutors last year.
Rove said he decided to leave after White House Chief of Staff Joshua Bolten told senior aides that if they stayed past the Labor Day holiday they would be obliged to remain through the end of the president's term in January of 2009.
Rove has closely advised the president since Mr. Bush first announced he was running for governor of Texas in 1993.