Republican lawmakers are asking for punishment against the former Joint Chiefs Chairman for perceived moves undermining civilian control of the military.
The military is preparing to send at least 800 more troops to the Mexican border to help the Border Patrol, as a caravan of thousands of Central American migrants continues to move north.
As polls show the possibility of significant Democratic wins in the midterms, military advocates may soon have to grapple with the possibility of a politically divided government.
Officials in Beijing have yet to comment on passage of the American destroyer and cruiser, but in the past the Chinese government has taken a hard line against Navy vessels transiting the waterway separating mainland China from Taiwan.
Defense Secretary Jim Mattis sounded optimistic Monday about the chances of repairing an unknown number of F-22s and other aircraft that were damaged when Hurricane Michael battered Tyndall Air Force Base in Florida last week.