Is that supposed to be a joke?

Trump strolls out of the White House one snowy morning to find that someone has written, in piss, "Trump is a bastard" in the snow. Enraged, he orders his security team to investigate.

Later:

"Well, sir, the urine sample matches the DNA of Mike Pence. But that isn't all, sir..."

"Whaddya mean?"

"Well, sir, the handwriting is Melania's..."