This article describes Trump's Covid-19 press conference on April 15th, in which he stated that:
"I have a very strong power. I'd rather not use that power, but we have way over a hundred people that we very badly need in this administration that should've been approved a long time ago,"
The article says that this refers to Trump
considering using constitutional authority to adjourn both chambers of Congress so that he can appoint his nominees for key positions without waiting for confirmation from the Senate.
Which provisions in the Constitution allow firstly for the President to adjourn Congress, and secondly for nominees for federal positions to be approved by the President without oversight from the Senate? Have these provisions ever seen use before?