The Valley's planned expansion of light rail could be at risk if President-elect Donald Trump and the Republican-controlled Congress withhold federal dollars, Valley Metro chief executive Scott Smith says on this weekend's "Sunday Square Off."

Light-rail funding depends on a local transit tax as well as federal money.

Three expansions in the works right now would need federal dollars for completion, Smith said. The former Mesa mayor and GOP candidate for governor was named Valley Metro CEO last month.

If Congress and the new president don't come across with anticipated dollars, Valley Metro will have to get "creative," Smith said.

Also on this weekend's "Square Off," the roundtable of Stacey Champion, of Champion PR and Consulting; Barrett Marson, of Marson Media; and Roy Herrera, an attorney and former legislative staffer for Democratic Congressman Ed Pastor, discuss:

-Whether Arizona Democrats' strongest candidates for higher office - members of Congress Kyrsten Sinema and Ruben Gallego - are now stuck in dead-end jobs in the House.

-Why Gov. Doug Ducey's dream car - a high-end electric vehicle made by a start-up company - faces a rocky road in building an Arizona factory.

-What fired state agency director Tim Jeffries was thinking when he created his own private militia - and no one else at the Capitol seemed to know.

"Sunday Square Off" airs at 8 a.m. Sundays on 12 News, right after NBC's "Meet The Press."