(CNN) Republican Rep. John Shimkus of Illinois is going further than many of his fellow GOP lawmakers in criticizing President Donald Trump's shift in Syria strategy, declaring he no longer supports Trump altogether because of the move.

Even as congressional Republicans largely stand behind the President as he faces an impeachment inquiry in the House, lawmakers from Trump's own party this week have joined Democrats in widely condemnation of his recent decision that enabled Turkey to launch an attack on Kurdish forces who fought alongside Americans to defeat ISIS.

Trump decided to reposition a small number of US troops in northern Syria, effectively giving the green light to the Turkish offensive against the Kurds who have long been the US partner in fighting ISIS in Syria.

"It's terrible. It's despicable," he said.

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