The donations were a kind of unintentional gift to the de Blasio campaign: It has made tying Ms. Malliotakis, who represents parts of Staten Island and Brooklyn in the Assembly, to the national Republican Party and specifically to Mr. Trump a centerpiece of its strategy since she became the Republican front-runner last month.
“Their pockets have no bottoms,” Mr. de Blasio’s campaign said of the Mercers in an email sent to supporters on Monday. The email linked the Mercers to Mr. Trump’s chief strategist, Stephen K. Bannon, and the right-wing website Breitbart News. The email also referred to Ms. Malliotakis as “a Trump acolyte.”
Ms. Malliotakis, speaking at a news conference in Queens to attack the mayor’s handling of crime and police issues, dismissed concerns about the donations as “irrelevant” and said she believed the mayor had also accepted money from people whom he “does not see eye-to-eye with all the time.” She added, “It has nothing to do with Trump.”
Sal Albanese, a lawyer and former city councilman who is the most prominent Democratic challenger to Mr. de Blasio, brought in more money than in previous two-month periods, with $41,000 this time around, but he spent it just as fast. He remains far from his goal of qualifying for the city’s matching program; a candidate for mayor must raise $250,000 to receive matching funds.
Mr. Albanese could still qualify for the Democratic primary debate with Mr. de Blasio next month. With his current contributions, he would have to collect roughly another $50,000 by Aug. 11 to meet the threshold for the debate.
Bo Dietl, who is running for mayor as an independent, raised $245,266 during the two-month reporting period. Notably, he raised only $38,020 after Mr. Massey dropped out — a development that might have been seen as a boost to his bid as well. Mr. Dietl spent more than he raised over the last two months, including more than $150,000 on television advertising.
Mr. Dietl, a former police detective who runs a private investigation company, had hoped to challenge the mayor in a Democratic primary but made a mistake filling out his voter registration form and wound up without a party affiliation. He then lost a court case in which he sought to run as a Republican. (Filings show he paid $10,000 to a lawyer, Martin Connor, who assisted in that effort.)
Another independent candidate, Roque De La Fuente, a millionaire real estate developer and California transplant, continued…