House Republicans moved forward with a bill that would bar members of Congress and their families from placing bets on certain Washington-focused prediction markets, Politico reported.

The House Administration Committee voted along party lines to advance the legislation, which would prohibit lawmakers, their spouses and dependent children from engaging with prediction markets to bet on the outcome of elections or government actions, according to Politico.

Democrats opposed the bill, saying it didn't go far enough.

The bill is "so filled with loopholes that it looks more like a sieve than a bill," Rep. Joe Morelle, D-N.Y., said.

Morelle pointed to a Senate bill that banned senators and their staff from using prediction markets.

"The Senate did it in a matter of minutes, no six-month grace period, no procedurally laborious process," Morelle said. "They just went to the floor with a two-page resolution and banned it all unanimously. We should do the same."

Rep. Bryan Steil, R-Wis., the chair of the committee, asked why members' families shouldn't be allowed to use prediction markets for sports, but could use sportsbooks or casinos.

"Lawmakers elect to serve the American people, not to enrich themselves by wagering on outcomes from the decisions they make," Steil said.

"We have a real opportunity to restore trust in Congress by taking necessary steps to eliminate even the appearance of impropriety," Steil added.

In May, Sens. Kirsten Gillibrand, D-N.Y., and Dave McCormick, R-Pa., proposed a bill that would ban members of Congress, the president, the vice president and senior executive branch officials from placing trades at sites such as Kalshi and Polymarket.

An Army special forces master sergeant, Gannon Ken Van Dyke, was charged with using classified intelligence about the capture of then-Venezuelan President Nicolas Maduro to profit on the prediction market Polymarket.

Prosecutors say he cleared more than $400,000 on the trades in what authorities describe as the first criminal insider-trading case involving a U.S. event-betting platform.

Van Dyke has pleaded not guilty.