The Democratic Congressional Campaign Committee is accusing its GOP counterpart, the National Republican Congressional Committee, of violating ethics rules by sending trackers to video record members of Congress in House office buildings.

The DCCC filed a complaint with the Office of Congressional Ethics on Monday alleging the NRCC and its chairman, Minnesota GOP Rep. Tom Emmer, violated House rules barring lawmakers from using official resources for political purposes. Twitter accounts for the NRCC and some of the committee’s spokespeople posted videos of Democrats in House office building hallways being questioned by someone in December and January.

Trackers, or campaign staffers who take video of candidates and pepper them with questions, are common. But the Capitol complex has been considered off-limits for trackers in the past. The DCCC contended in its complaint that trackers on the Capitol grounds are not just frowned upon, they violate the rules.

The complaint cited a rule in the House Ethics manual that states, “The House buildings, and House rooms and offices — including district offices — are supported with official funds and hence are considered official resources. Accordingly, as a general rule, they may not be used for the conduct of campaign or political activities.”