Ted Cruz's ex-roommate ridicules his 'calculated' Trump endorsement: He has 'defeated himself'
Sen. Ted Cruz (R-TX) (WMUR)

Sen. Ted Cruz's (R-TX) college roommate explained the Tea Party lawmaker's decision on Friday to endorse Donald Trump's presidential campaign, the Boston Globe reported.

While others were surprised that Cruz would back the GOP's presidential nominee after calling him a "pathological liar" during the party primaries, Craig Mazin said, he was not. According to him, the key to understanding Cruz's motivation is to start one's every thought with the phrase, "I'm supposed to be president," or ISTBP for short. Doing so meant getting into Cruz's head.

"I apologize for that," he wrote. "But hey, it's not as bad as living with him."

Mazin broke down his theory in a series of tweets, some of which can be seen below:

Therefore, Mazin said, that Cruz would endorse the man who insulted his wife Heidi is not about principle, but about the "calculation" that he believes will eventually lead him to the presidency. However, he added:

After concluding his explanation, though, Mazin couldn't resist another jab at his former roommate: