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KNOW IT ALL: Tuesday's Top 6 Stories at NBC News

From a judge blocking President Barack Obama's immigration policy to more snow and ice spanning the South, see the stories we're following.

Good morning, and happy Fat Tuesday. Here are some of the stories we’re following today:

1. Judge blocks Obama policy on immigration

A federal judge in southern Texas on Monday temporarily blocked President Barack Obama's plan to shield up to 5 million undocumented immigrants from deportation. The ruling by U.S. District Judge Andrew Hanen in Brownsville allows a lawsuit filed by Texas and 25 other states to challenge the administration's executive order issued in November. The president bypassed Congress when he said that undocumented immigrants whose children are U.S. citizens or legal permanent residents could stay in the country without the immediate fear of being deported. The Justice Department plans to appeal Hanen's ruling. Read more in NEWS.

2. Ice storm knocks out power, dumps more snow

About 22 million people across parts of the South and the Mid-Atlantic are under winter storm warnings as a band of ice and snow continues its assault. More than 330,000 people across 13 states and Washington, D.C., are without power, according to The Weather Channel. Parts of Kentucky, Virginia and West Virginia got the brunt of the snow Monday, including more than a foot in several areas. Now, as the system starts to pull away, forecasters say D.C. could see about 8 inches of snow, New York could get 3 inches and parts of New Jersey, 7 inches. Read more in NEWS.

In Hampton, Virginia, an SUV careened out of control, crashed into another vehicle and barreled toward a camera being used by NBC affiliate WAVY. It stopped just inches short:

3. Egypt calls on world coalition to fight ISIS

Egypt began waging an air campaign against ISIS in Libya after a video released Sunday purported to show 21 Egyptian Christians beheaded. Egyptian President Abdel-Fattah el-Sissi is asking other nations to join its fight against the militants in Libya. "There is no other choice, taking into account the agreement of the Libyan people and government and that they call on us to act," el-Sissi said in a Tuesday radio interview. The U.S. is already leading a coalition against ISIS in Syria and Iraq. Read more in NEWS.

4. Copenhagen shooter had ‘good heart,’ friend claims

The man suspected of opening fire at a free speech event in Denmark's capital and a synagogue never seemed like the type who would unleash such violence, a friend told NBC News. But Omar Abdelhamid Hussein, who was named in a Danish court as the main suspect in the shootings, had been in jail and was released just before the bloodshed that left two dead and five injured in back-to-back attacks. "I experienced Omar as a normal young man, who was loyal towards his friends and who had a good heart," the friend said. Hussein, 22, was killed by police, but two other men have been charged as accomplices. Read more in NEWS.

5. ‘American Sniper’ jury hears gunman’s confession

Jurors in the trial of Eddie Ray Routh heard him admit in a videotaped interview with police that he killed Navy SEAL Chris Kyle and friend Chad Littlefield in Texas two years ago. Routh, now 27, had gone to a gun range with the pair when he killed them. The former Marine corporal has been in the grip of a medically diagnosed psychosis, his lawyers say. "I'm just sorry sorry for what I've done, you know, and we can work this out," Routh told police, adding, "I guess I need to be doing more things in this town than hurting people." Read more in NEWS.

6. Chapel Hill shooter indicted in student slayings

Craig Stephen Hicks, 46, was indicted Monday on three counts of murder in the deaths of a husband and wife as well as her sister. Hicks was also indicted on one count of discharging a firearm into an occupied dwelling, according to the Durham County Superior Court clerk's office. All three victims were Muslim, and the father of the two sisters has branded the killings as a "hate crime." The FBI late last week announced an inquiry, but local police in Chapel Hill, North Carolina, say the primary motive for the attack was a parking dispute. Read more in NEWS.

... What's trending today?

One of the favorites to win best in show at the annual Westminster Kennel Club dog show Tuesday has a close tie to the White House. It turns out that Matisse, a Portuguese water dog, is from the same bloodline as Sunny, the Obamas' youngest dog, according to Matisse's owner. He said the pups share the same grandfather, although they have different grandmothers and parents.