Republicans have pulled out a victory in Kansas in the first of four U.S. House special elections to replace GOP congressmen named to top jobs in President Donald Trump’s administration, but the next contest for a seat in Georgia could be tougher.

The margin of victory Tuesday for Republican Ron Estes in the Kansas 4th District special election slid to only seven percentage points from a 31-point margin in November, when incumbent Mike Pompeo was running before he was appointed Trump’s CIA director.

Estes narrowly lost the district’s most populous county around the city of Wichita. Trump won that county by 18 points.

The outcome was a shot across the bow of the national Republicans as the party faces an even more difficult contest on April 18 in Georgia.]