State Senate candidate Jaime Areizaga-Soto called on his Democratic primary opponent, Barbara Favola, to resign from the Arlington County Board on Thursday after he said she took $2,500 from Advance Towing and voted five days later to increase towing fees.

Favola, Areizaga-Soto said, cast the deciding vote on the increase that is expected to generate hundreds of thousands of dollars for Advance Towing.

  “Barbara Favola has violated the Arlington County Code of Ethics,” Areizaga-Soto said. “It is time for Barbara Favola to resign from the County Board and quit using her public position for political gain. This is the worst of politics and shows disrespect for the values that Democrats believe in and fight for.”

Favola’s campaign said the $10 increase in towing fees that Favola voted for was recommended by an advisory board. 

Favola campaign manager Adam Scott accused Areizaga-Soto of exaggerating. “Everyone knows where Barbara gets her campaign contributions because it’s posted online,” Scott said. “But Jaime has yet to come clean about where he made the money he is using to fund his campaign.”

Favola’s campaign called on Areizaga-Soto to disclose the clients he represented as a corporate attorney and the projects that he worked on.

Favola and Areizaga-Soto, who formerly worked for the general counsel’s office at the U.S. Agency for International Development, have been trading increasingly negative accusations for weeks as they vie to replace retiring Sen. Mary Margaret Whipple (D-Arlington).

Republicans are in a fierce battle for control of the Senate, where Democrats hold a fragile 22-to-18 majority.

The 31st district, which includes parts of Arlington, Fairfax and Loudoun counties, is Democratic-leaning. The winner of the August primary will face Republican Caren Merrick in November.