David Hogg, the Parkland, Fla., high school student who has become a gun control activist, called out Sen. John McCain John Sidney McCainBiden's six best bets in 2016 Trump states Replacing Justice Ginsburg could depend on Arizona's next senator The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R-Ariz.) on Friday for accepting contributions from the National Rifle Association (NRA).

"Why do you take so much money from the NRA?" Hogg said on Twitter in response to an apparently unrelated op-ed by McCain on a public river redevelopment project in Phoenix.

Why do you take so much money from the NRA? — David Hogg (@davidhogg111) March 30, 2018

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McCain, the 2008 GOP nominee for president and a Vietnam War veteran, is the number one recipient of campaign contributions from the gun rights group, according to the Center for Responsive Politics.

The NRA has been repeatedly criticized by Hogg and other students from Marjory Stoneman Douglas High School since a shooter killed 17 people at the school. The students have pushed for tougher gun control laws and decried the NRA's influence over politicians.

McCain was diagnosed with brain cancer last year and has not been seen in Washington in 2018.