5 things to know today: Ga. Republicans concerned about health plan; Suspicious substance found at Capitol; Cold weather to stick around

1. Why Georgia Republicans are nervous about House health plan. Georgia Republicans are sharply divided over the GOP proposal to replace the Affordable Care Act that's galloping through the U.S. House of Representatives, raising concerns about the lack of a cost estimate for the overhaul and its impact on the state's budget as it moves through Capitol Hill. [Read here]

2. Hazmat unit responds to suspicious substance at Georgia Capitol. The Gold Dome is taped off while crews investigate the source of a green substance in a bag found along Washington Street and Martin Luther King Jr. Drive, according to the WSB 24-hour Traffic Center. [Read here]

3. Complete coverage: High school basketball state championships. Four Georgia basketball teams are ranked No. 1 in the final high school basketball poll for the first time, the final reward for their first-ever state championships. See the final rankings, state recaps, photos and more. [Read here]

4. John McCain: Trump should provide evidence of wiretapping or retract accusation. Sen. John McCain made a Sunday morning appearance with CNN's Jake Tapper, who asked the Arizona Republican whether he's concerned about the "constant barrage of conspiracy theories" coming from President Donald Trump. [Read here]

5. Cold to stick around; more snow possible. A cold blast this week could usher in "the longest streak of below normal temperatures this winter" and another round of snow, according to Channel 2 Action News. [Read here]

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