President Bush’s top adviser Karl Rove has announced he will step down as White House deputy chief of staff on August 31. Rove’s resignation comes while he is at the center of several congressional investigations. Last month Senate Judiciary Chair Patrick Leahy subpoenaed Rove to testify about his role in the politicization of the Justice Department and the firing of nine U.S. attorneys. So far Rove has ignored the subpoena and has refused to testify, citing executive privilege. In addition, two weeks ago Rove skipped a congressional hearing on the allegedly improper use by White House aides of Republican National Committee email accounts. Rove told The Wall Street Journal that he is resigning in order to spend more time with his family. For the past 19 years Rove worked as George W. Bush’s closest political adviser, first in Texas, then in Washington. During that time he earned the nickname of Bush’s Brain.