Of the 16 newly diagnosed patients, 15 have returned to duty in Iraq, the Defense Department said.
Joshua Vallow, 7, and Tylee Ryan, 17, were last seen in September.
The man was taken into custody by Prince George's County police responding to reports that a driver had struck multiple vehicles.
"This is a very fast moving, constantly changing situation," Health and Human Services Secretary Alex Azar said.
Unless the Senate alters its rules, Lev Parnas' GPS device will probably make his attendance in the Senate Gallery impossible.
