Come and have a go if you think you're hard enough.
Boil it down and that's what Sir Keir Starmer said to the cabinet today, at the start of what was - let's remember - just its standard weekly scheduled meeting.
The prime minister's message was spoken to a full meeting of 28 cabinet ministers.
But it was directed at one person present: Wes Streeting, the health secretary.
Streeting has been clear with the prime minister for months that he is ready for a leadership contest should one take place. But he has also been adamant that he would not be the person to trigger one.
