Sen. Pat Roberts Charles (Pat) Patrick RobertsThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy The Hill's Morning Report - Sponsored by National Industries for the Blind - Trump seeks to flip 'Rage' narrative; Dems block COVID-19 bill GOP senators say coronavirus deal dead until after election MORE (R-Kan.) is concerned about the direction of the nation’s foreign policy during a week that saw Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE's resignation and President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests 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.