Updated at 8:34 p.m. ET

Sen. Claire McCaskill, D-Mo., also took to her Twitter account to say she'll give up her pay if the government shuts down. She's asking if the money should go to the U.S. Treasury or to Honor Flight, an organization that helps older veterans travel to Washington, D.C.

Updated at 8:10 p.m. ET

Rep. John Fleming, R-La., just tweeted:

Will decline salary if democrats force shutdown

Updated at 6:18 p.m. ET

Rep. Joe Wilson, R-S.C., says he'll donate his paycheck if the government shuts down.

Our original post begins here:

Add House Speaker John Boehner to the growing list of members of Congress who say they'll skip their paycheck if the federal government shuts down tonight.

By law, members of Congress and the president would continue to receive their pay in the event of a government shutdown.

Boehner is sending a letter to House lawmakers explaining how the House Administration can help them return their pay to the U.S. Treasury, which he plans to do.

Several lawmakers in both parties have said they will either donate their pay to charity or give it back to the U.S. Treasury if a budget deal cannot be reached and the government closes its doors at midnight.

Senate Majority Leader Harry Reid, D-Nev., has joined an effort led by Sen. Joe Manchin, D-W.Va., to get members of Congress to give up their pay. Manchin's "no budget, no pay," pledge has attracted support from two dozen lawmakers, including Republicans John McCain of Arizona and freshmen senators Mark Kirk of Illinois and Pat Toomey of Pennsylvania.

Boehner's annual salary is $223,500 -- the most for a member of Congress because he is by law second in line to the presidency. Reid earns $193,400. Members outside of the top leadership group receive $174,000 for 2011.