Senator calls on FAA to reject Boeing's request for safety waiver for the 737 Max 7

In a letter obtained exclusively by CBS News, Democratic Sen. Tammy Duckworth of Illinois, chair of the Senate Subcommittee on Aviation Safety, demanded that the Federal Aviation Administration reject Boeing's request for a safety waiver on the so far uncertified 737 Max 7, the smallest of the four 737 Max variants. 

"Boeing forfeited the benefit of the doubt long ago when it comes to trusting its promises about the safety of 737 MAX, and the FAA must reject its brazen request to cut corners in rushing yet another 737 MAX variant into service," she wrote in the letter sent late Wednesday to FAA Administrator Michael Whitaker.

The letter was penned on the same day that Boeing CEO Dave Calhoun traveled to Washington, D.C., to meet with legislators in the wake of an incident earlier this month in which the door panel of a 737 Max 9 blew off during an Alaska Airlines flight.