At a rally in Biloxi, Mississippi, tonight Trump also pledged to reverse any action Obama takes on gun control if he is elected President

Texas Gov Greg Abbott criticized President Barack Obama's plan to move ahead with possible executive actions on guns in a tweet in which he told the Commander-in-Chief to 'come & take' the state's guns.

Obama said in his weekly radio address that he is looking for ways to keep guns out of the hands of 'a dangerous few' without depending on Congress to pass a law on the fraught subject of gun control.

He plans to meet his attorney general, Loretta Lynch, on Monday to see what executive actions might be possible. Steps to strengthen background checks could come this week.

At a rally in Biloxi, Mississippi, tonight Donald Trump also pledged to undo any action Obama takes on gun control if he wins the next election.

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Texas Gov Greg Abbott mocked President Barack Obama's push for executive action in a tweet on Friday, saying that Obama needed to 'come and take' the state's guns. As Obama made his announcement, a Texas law allowing licensed handgun owners to openly carry their weapons in public went into effect

Abbot's tweet featured a photo of a star - much like the one on Texas's state flag - and a cannon barrel featuring the words 'Come and take it'

Trump said: 'He can't do that. I will veto that. I will unsign that so fast, so fast.'

Meanwhile Governor Abbot tweeted: 'Obama wants to impose more gun control. My response? COME & TAKE IT,' he said in his tweet, while mentioning the NRA.

As Obama made his announcement, a Texas law allowing licensed handgun owners to openly carry their weapons in public went into effect.

'The gun lobby is loud and well organized in its defense of effortlessly available guns for anyone,' Obama said in his address. 'The rest of us are going to have to be just as passionate and well organized in our defense of our kids.'

He said he gets so many letters from parents, teachers and children about the 'epidemic of gun violence' that he can't 'sit around and do nothing'.

Obama recently directed staff at the White House to look into potential executive actions.

Currently, federally licensed firearms dealers are required to seek background checks on potential firearm purchasers.

But advocacy groups say some of the people who sell firearms at gun shows are not federally licensed, increasing the chance of sales to customers prohibited by law from purchasing guns.

A source familiar with the administration's efforts said Obama is expected to take executive action next week that would set a 'reasonable threshold' for when sellers have to seek a background check.

That person didn't know whether it would be based on the number of guns sold or revenue generated through gun sales.

The source, a member of a gun control advocacy group, was not authorized to discuss details before the announcement and spoke on condition of anonymity. White House officials won't confirm the timing.

Obama said in his weekly radio announcement that he'll meet his attorney general, Loretta Lynch, on Monday to see what executive actions might be possible

In his efforts to work around a Congress that has often been politically gridlocked, Obama has made aggressive use of executive power, particularly on immigration. It has been an increasingly effective presidential tool.

And while legal scholars are divided on whether Obama has accelerated or merely continued a drift of power toward the executive branch, there's little debate that he's paved a path for his successor.

Depending on who succeeds him, many Obama backers could rue the day they cheered his 'pen-and-phone' campaign to get past Republican opposition in Congress.

The unilateral steps he took to raise environmental standards and ease the threat of deportation for millions of immigrants in the United States illegally may serve as precedent for moves they won't cheer.

The National Rifle Association opposes expanded background check systems.

The organization's Institute for Legislative Action says studies have shown that people sent to state prison because of gun crimes typically get guns through theft, the black market or family and friends.

Also, many purchases by criminals are made from straw purchasers who pass background checks.

'No amount of background checks can stop these criminals,' says the group's website.

Obama has consistently expressed frustration after mass shootings, saying it shouldn't be so easy for somebody who wants to inflict harm to get his or her hands on a gun.

Going into his final year in office, Obama said his New Year's resolution is to move forward on unfinished business.

'That's especially true for one piece of unfinished business, that's our epidemic of gun violence,' Obama said in his weekly address.

He said a bipartisan bill from three years ago requiring background checks for almost everyone had huge support, including among a majority of NRA households. But the Senate blocked it.