Legally yes he can. Highly unusual but legal
He’ll do it then ...
On recess appointments
http://www.senate.gov/reference/resources/pdf/RS21308.pdf
Eisenhower nominated Earl Warren to the Supreme Court as a recess appointment.
“Eisenhower gave Warren a recess appointment that began on October 1, 1953. It was made permanent when the Senate acted on March 1, 1954. No serious opposition had appeared and he was confirmed by unanimous voice vote.”
Someone needs to call Congress into session then.