WASHINGTON — President Joe Biden announced Tuesday that the new White House counsel will be Ed Siskel, a former Obama administration attorney who helped craft the response to the congressional investigations into the 2012 Benghazi attack that killed four Americans, including the U.S. ambassador.Siskel, who’ll begin in September, takes over during a critical time at the White House, when Biden is vying for reelection and congressional and judicial investigations into his administration and family are swirling …