Senate Minority Leader Charles Schumer Chuck SchumerVideo of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral Graham signals support for confirming a Supreme Court nominee this year Pelosi orders Capitol flags at half-staff to honor Ginsburg MORE (D-N.Y.) on Thursday sought to increase the pressure for President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE to buck the gun lobby on reform, only to declare a few hours later that Trump had already caved to the National Rifle Association (NRA) on gun reform.

"The last time he showed support for sensible gun reform — no fly, no buy — he quickly dropped his support once the NRA opposed it. I hope this time will be different," Schumer said in a statement early Thursday afternoon.

Trump this week appeared to signal a shift on guns in the wake of last week's school shooting in Florida, where 17 people were killed.

He said in a tweet earlier Thursday that he will be "strongly pushing Comprehensive Background Checks with an emphasis on Mental Health," as well as raising the age for buying a gun.

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"Raise age to 21 and end sale of Bump Stocks! Congress is in a mood to finally do something on this issue — I hope!" he added in the tweet.

But Trump also expressed support for implementing concealed carry for trained teachers and getting rid of gun-free zones around schools.

As a result, a few hours later on Thursday, Schumer said that because Trump is open to "the NRA-backed proposal to arm teachers," the NRA had "reeled" the president "back in" on guns.

“Not surprised the NRA reeled President Trump back in," Schumer said in a second statement. "Just amazed at how fast it happened.”

In 2016, during his presidential campaign, Trump indicated he would consider backing a "no fly, no buy" policy to restrict individuals on the airline terrorist watch list from being able to purchase guns and said he would meet with the NRA to discuss it. The NRA opposed such legislation, and Trump later walked back his support, saying he "understands exactly" the organization's position.

Schumer cited that shift on Thursday, saying that historically, Trump and GOP lawmakers "have toed the NRA line."

"The real test of President Trump and the Republican Congress is not words and empathy, but action. Will President Trump and the Republicans finally buck the NRA and get something done? Could this time be different?" he added.

Trump also praised the NRA on Thursday, saying they are "Great People and Great American Patriots."

"They love our Country and will do the right thing. MAKE AMERICA GREAT AGAIN!" he added in a tweet.

Updated at 6:30 p.m.