Presidents are allowed to make recess appointments during Senate recesses, unless the president is blocked by a “procedure” called “Pro Forma sessions”. This article talks about how Thune has used it to block Trumps appointments:
The latest to use this tactic is Missouri’s senator Josh Hawley. The swamp does indeed run deep.
President Trump forces then to come out of their holes one by one. Keep showing yourselves, you two faced hacks.