Trump is trying to figure out who's going to run against him in 2020.

Trump’s chief strategist, Steve Bannon, asked consultants to scour the backgrounds of four outspoken Democrats — Ohio Sen. Sherrod Brown, Connecticut Sen. Chris Murphy, Colorado Gov. John Hickenlooper and Dallas Mavericks owner Mark Cuban, two sources close to the administration said....

The White House believes both Vermont Sen. Bernie Sanders and Massachusetts Sen. Elizabeth Warren are “too old” to mount a serious campaign three years from now, sources said....

“Elizabeth Warren is 100 years old....” the second source said....

She's 67.

Trump’s political team is also counting out [NY Governor Andrew] Cuomo and New Jersey Sen. Cory Booker, because they’ve been tainted by corruption probes....

[Kirsten] Gillibrand, 50, has been raising her profile thanks to a series of “no” votes on Trump’s Cabinet picks, but White House officials view her as “too young” and believe she lacks the network in the party to run a nationwide campaign, the sources said.

So 67 is too old and 50 is too young. Noted.
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* I'm steeling myself for all the born-lame jokes about how hard it is to see in 2020. The headline at the link is "Trump’s White House eyes potential foes in 2020 election." Did they write "eyes" because it will be 2020? No 20/20 jokes. I'm pre-banning them. It's bad enough to have to plunge back into another campaign season.