“So far, Claire has yet to ask for those ads to come down, despite her purported strong opposition to dark money groups,” National Republican Senatorial Committee spokesman Michael McAdams said. “Makes you wonder, why has Claire stayed silent?”

LaBombard responded: “Claire’s taken the strongest possible step on dark money ads, which is strongly supporting and voting for legislation to force disclosure by these groups. While Republicans have blocked that legislation, she’s called on these groups to disclose their donors, and has told Missourians they should only pay attention to the ads run by candidates.”

He said outside groups have run more ads attacking McCaskill than those defending her have spent so far in this election cycle.

Spokespeople for Tester and Schumer, D-N.Y., did not immediately respond on the record Tuesday.

Members of Congress annually must file financial disclosure forms in which they disclose personal wealth across a broad reporting range. The last major ranking of the wealth of all 535 members of Congress was done by the Capitol Hill newspaper Roll Call in late 2015.