Are Members Of Congress Tweeting About Breaking Federal Law?

This tweet is not a lone this week a lot of members of Congress are calling for their pay to be withheld or suspended for the duration of the shutdown. This seems like a reasonable gesture right? We are shutdown Americans who work for the government are not being paid as a representative of the people I should stand with them in solidarity. Sounds like the right thing to do. In fact though if McMorris Rodgers actually went through with this is would be against federal law.

The Twenty-seventh Amendment (Amendment XXVII) prohibits any law that increases or decreases the salary of members of the Congress from taking effect until the start of the next set of terms of office for Representatives

From CNN 
The 27th Amendment to the Constitution restricts any Congress from changing its own pay. The measure was proposed in the first days of the Republic but was not ratified until 1992, after a grass-roots movement promoted the idea and the necessary number of state legislatures approved it. 
Of course I am just nit-picking here McMorris Rodgers are entitled to do whatever they to do with their paycheck.