Can President Trump call a state of emergency over border wall

President Trump has threatened to declare a state of emergency to fund the border wall without going through Congress. Hear from constitutional expert Robert McWhirter about whether the president can declare a state of emergency in this situation.

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Constitutional Expert Robert McWhirter

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Take 2: ‘Catalyst’ returns to Arizona PBS

Bailey Netsch, a former student in the Walter Cronkite School of Journalism and Mass Communication, receives professional tips from Cronkite Professor of Practice Steve Filmer in April 2018 as they shoot video for the inaugural season of the PBS series "Catalyst." The show returns for a second season on Wednesday, Feb. 13. Photo by Charlie Leight/ASU Now.

The second season of the high-quality science series showcases interdisciplinary university research institutes and initiatives at ASU.

'Victoria' Season 3: A fearless monarch faces down crisis

Victoria Season 3 on Masterpiece begins Sunday Jan. 13 at 8 p.m.

It is 1848, and revolution is breaking out across Europe. In Britain, one woman stands between order and chaos. Sundays at 8 p.m., beginning Jan. 13.

'I've Gotta Be Me' honors the life and legendary talents of Sammy Davis Jr.

"Sammy Davis Jr.: I've Gotta Be Me" documentary comes to Arizona PBS on Tuesday, Feb. 19, at 8 p.m.