Boston mayoral candidate Josh Kraft knocked incumbent Mayor Michelle Wu on Sunday for the costs of her high-stakes testimony on Capitol Hill last week, a bill that included up to $650,000 for outside legal counsel.

As her opponent seeks to capitalize on her perceived housing vulnerabilities, Boston Mayor Michelle Wu announced that the city has invested $10 million in federal funds towards converting 347 market-rate units to affordable homes.

Boston Mayor Michelle Wu says she will make a “major housing announcement” Monday morning in Mattapan. She is scheduled to speak at 10 a.m. at the Fairlawn Estates apartment complex. Wu will join residents of the Fairlawn Estates,