Mayor Bill de Blasio said he's staying out of the heated Democratic primary for the 13th Congressional District in upper Manhattan and the Bronx.

Rep. Charles B. Rangel is facing off with State Sen. Adriano D. Espaillat, who lost in a heated race two years ago. 

Both candidates joined de Blasio at a press conference on affordable housing this morning, but De Blasio said he won't endorse a candidate.

"I think there's times, especially in the context of a Democratic primary, where you say it's not a particularly appropriate place to get involved, for a variety of reasons," said de Blasio. "I had to make a baseline decision, did I think I should be involved; I came to the conclusion I should not be. And we'll obviously know in two weeks who the Democratic nominee is and I'll support the Democratic nominee."

Harlem minister Michael Walrond and Bronx activist Yolanda Garcia are also in the race. The vote is set for June 24.