Just really can’t come up with the same evidence.
Check it out:

White House science czar Dr. John Holdren wasn’t in the mood to be contradicted on whether global warming was causing “extreme weather.” Holdren described climate scientists whose work contradicts the White House’s global warming claims as outside the “scientific mainstream.”

Holdren was asked by Alabama Republican Sen. Jeff Sessions to cite scientific data that supported claims that droughts and other weather events were being made worse by global warming. Sessions then cited contradicting evidence from climate scientists, including former NASA scientist Dr. Roy Spencer and University of Colorado climate scientist Roger Pielke, Jr.