Pelosi's office receives suspicious letter with white powder as mailings hit dozens of Congress offices

▲ Escalating

Trump orders lawsuit to block certification of Alaska Senate race if Republican loses

Trump said he instructed his administration to sue to block certification of the Alaska Senate race if Republican Dan Sullivan loses, citing two similarly named Republicans on the ballot. This raises questions over whether he will accept a midterm defeat. Earlier in the week, white-powder letters reached more than three dozen members of Congress, including Nancy Pelosi's office.

• Trump cited two similarly named Republicans on the Alaska ballot.
• Preliminary tests on powder sent to one lawmaker's office showed it was not hazardous.
• Aipac said it will stop endorsing candidates or making direct contributions.