GOP senator on Syria pullout: 'Bad people' will fill the void

Sen. Pat RobertsCharles (Pat) Patrick RobertsInternal poll shows Kobach trailing Democrat in Kansas Senate race Here are the lawmakers who aren't seeking reelection in 2020 Hillicon Valley: Lawmakers ramp up Silicon Valley antitrust probe | Treasury sanctions North Korean cyber groups | Thiel to host Kobach fundraiser MORE (R-Kan.) is concerned about the direction of the nation’s foreign policy during a week that saw Defense Secretary James MattisJames Norman MattisThe Hill's Morning Report - Trump takes 2020 roadshow to New Mexico Trump needs a national security adviser who 'speaks softly' US could deploy 150 troops to Syria: report MORE's resignation and President TrumpDonald John TrumpJulián Castro: It's time for House Democrats to 'do something' about Trump Warren: Congress is 'complicit' with Trump 'by failing to act' Sanders to join teachers, auto workers striking in Midwest MORE's decision to withdraw troops from Syria.

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“I think when you leave an area where it's very troublesome in terms of our national security overall you leave a void and bad people fill it and then you have a much bigger problem,” Roberts told reporters Monday.

Roberts indicated he's worried by the abruptness of Trump’s recent decisions and disregard of Defense recommendations. 

“I'm just worried about the overall policy, if all of a sudden on a Thursday morning we find out that we are taking half of our troops out of Afghanistan. What signal does that send? And it's not a good signal,” Roberts continued. Trump is also reportedly considering removing some troops from Afghanistan.

Roberts, who previously chaired the Senate Intelligence Committee and served on the Armed Services Committee, said while he once held a position similar to Trump's on foreign policy after Vietnam, he has changed his tune over time.

“It's just a different time, so I think you have to be fully engaged in areas where our national security team says that this is a real problem. … I'm always worried about national security because that danger will never go away,” he said.