Viv ‘backdoors’ Blas on immig $$

So much for the handshake. Just days after Mayor de Blasio and City Council Speaker Melissa Mark-Viverito announced a tentative deal on the city’s $85.2 billion Fiscal Year 2018 budget, the council bucked the mayor Tuesday by passing a spending plan with a new provision that de Blasio staunchly opposes.

The mayor had made it clear he wanted to restrict legal-services funding for immigrants facing deportation only to those who have not been convicted of felonies.

But at the 11th hour, the council added a provision that covers all immigrants who could get booted, with a defendant’s income the only criterion in dispensing $26 million in legal-defense funds.

The unusual move came after de Blasio’s bravado during a City Hall press conference — celebrating a handshake deal on Friday — rankled Mark-Viverito, according to sources.

At a meeting after Tuesday’s vote, Mark-Viverito complained to colleagues that de Blasio had turned their joint appearance into a contest over “whose d--k was bigger.”

“Basically, he said we can say whatever we wanted, but that the budget contracting goes through the executive [branch],” one council member who was at the meeting told The Post.

“He kept saying that over and over . . . He bigfooted us.”

Another source said the speaker and mayor had agreed before the handshake ceremony not to publicly make a big deal out of their disagreement.

“He went back on that in front of the cameras,” the source said.

At the Friday press conference, de Blasio said he would not allow the $26 million to go toward the defense of immigrants convicted of crimes included on a list of 170 felonies maintained by the city.

He acknowledged that he had been unable to settle his differences on the issue with Mark-Viverito, but left no doubt he intended to have the final word.

“The issue will be resolved in the contracting process . . . and the contracting process resides in the executive branch, so I’ll leave it at that,” the mayor said at the time.

“I have very strong views I’ve made clear.”

On another issue important to the speaker, the mayor said publicly for the first time on Monday that he thinks the Puerto Rican Day Parade erred in honoring Oscar López Rivera, a convicted FALN felon who has Mark-Viverito’s unwavering support.

The budget maneuver puts de Blasio in the position of being strong-armed into accepting the council’s conditions, or else vetoing the provision within five days. The council would then have 10 additional days to override the veto.

The mayor could also choose not to spend the legal-defense funds, although such a move would raise the specter of a court challenge.

“There is a clear, respectful difference of opinion between us and the speaker on this issue,” said mayoral spokeswoman Freddi Goldstein. “Our position remains unchanged.”