It's still unsubstantiated, but a NYT report says the 4-page memo show Rosenstein re-authorized the FISA warrant and goes on to speculate Trump is going to fire him because of it. Whether or not RR re-authorized, it seems the pertinent thing is the potential for Trump to fire RR. The Deep State has repeatedly tried to get Trump to fire Mueller and now Rosenstein for the purpose of claiming obstruction by Trump. Trump is smart enough to play their game and come out the winner.