Senate Democratic candidates began tying their Republican rivals to the policies of Donald J. Trump in March, when they began their “Party of Trump” campaign. Now, the Democratic Congressional Campaign Committee is joining in on the action.

As part of a “five-figure” digital purchase, the group is releasing a targeted ad campaign on 15 House races, tying Republican House leadership to the policy proposals of Mr. Trump.

The ad features mainly the Republican leadership, but the D.C.C.C. isn’t targeting any of the bold-Republican names like Speaker Paul D. Ryan with their digital buy. Rather, they have identified what they claim to be 15 important congressional districts where Mr. Trump is viewed particularly negatively, and targeting female independent and female Republican voters in those districts.

The targets range from New Jersey to Nevada to Florida.

The ads, which come in both 60-second and 30-second versions, rifle through some of Mr. Trump’s more contentious platforms, then cuts in with either news reports or video clips of members of the Republican House either directly or tangentially offering support.