Legislation that would reauthorize the Federal Aviation Administration for six months and provide tax relief to victims of recent hurricanes could fail on the House floor Monday evening amid Democratic opposition.

The minority party’s support is needed to pass the measure under a fast-track procedure known as suspension of the rules. Two-thirds support is required for passage on the suspension calendar, meaning at least 50 Democrats would need to vote “yes” if all 240 Republicans support the legislation.

House Democratic leaders on Monday announced their opposition to the measure, with Minority Whip Steny H. Hoyer and ranking members of the relevant committees penning a “Dear Colleague” letter urging the Democratic caucus to vote “no.”

“We write to ask that you join us in opposing it because the Majority is using this must-pass bill to push through unrelated Republican priorities — all while continuing to block Democrats from bringing the DREAM Act to the floor,” they wrote.

In addition to Hoyer, Transportation and Infrastructure ranking member Peter DeFazio, Energy and Commerce ranking member Frank Pallone Jr., Ways and Means ranking member Richard Neal and Financial Services ranking member Maxine Waters signed onto the letter.