Obama Gun Control Announcement Expected, Mix of Executive, Legislative Action Let's turn to the major announcement from the president this morning on gun violence. He's expected to call for a mix of legislative and executive action, including bans on military-style assault weapons and high-capacity ammunition clips. That's on the heels of andrew cuomo, signing the toughest gun control measures into law on tuesday. The first since the newtown shootings. Jon karl is covering this from the white house. And the president knows he's in for a fight. Reporter: That's for sure, george. And a sign of just how tough the fight will be, the nra is greeting the president's announcement this morning with a harsh, personal attack on the president. The nra video viciously attacks the president. He's just another elitist hypocrite. Reporter: The attack comes just after a week after the nra was invited to the white house to meet with vice president biden. Even without a personal attack like that, taking on the nra isn't easy. Trying to convince congress to vote for gun control, the president is hoping for assists from kids, like 11-year-old julia, who wrote the president in a letter obtained by abc news. I have four brothers and sisters. And I know I would not be able to bear the thought of losing any of them. Her idea, it should be hard for people to buy guns. 8-year-old grant wrote the president, there should be a limit on how many guns a person can own. The president's plan won't go that far. It will require on congress to require background chex on virtually all purchases. Limit the number of bullets in a magazine clip. And ban so-called assault weapons. The president will also take steps without congress, acting on his own to improve current background checks and to more vigorously enforce gun laws already on the books. I'm confident there's some steps we can take that don't require legislation. And that are within my authority as president. Reporter: Gun rights advoca advocates are vowing to fight hard. Former reagan attorney general, ed meese, even raised the possibility tuesday of impeaching the president if he goes too far. If he tried to override the second amendment, in any way, i believe it would be an impeachable offense. The president has a lot of power behind him. Remarkable cover of "time" magazine this morning. And look at gabby giffords right there. She's going to join the lobbying effort, as well. We expect to see gabby giffords and her husband, mark kelly, in the halls of congress, knocking on doors, talking to members, urging them to support the president's proposal. The president will need all the help he can get. Democrats in the senate say he probably doesn't have 50 democrats in the senate to support what he has to say. The president said he didn't know how much of this could pass. Jon karl, thank you very much.