"ISIS is the enemy of Russia, ISIS is the enemy of Assad, ISIS is the enemy of Turkey," Miller told CNN's Wolf Blitzer in The Situation Room. "Should we spend generations in Syria, spilling American blood to fight the enemies of all these countries?"
"ISIS has been defeated," he said. "But if ISIS wants to retreat and regrow and reorganize, it will leave the countries to defeat their enemy."
"He and the President had a great relationship," Miller insisted.
"As you know, President Trump believes that many wealthy countries are using the tremendous strength United States … while we protect these very rich countries," he added. "The President has strongly argued that a fair deal must be made for the American taxpayer and that we must ensure that we are only involved in activities that are in our national interest."
When Blitzer asked why the President tweeted this Mattis retired when the Secretary of Defense issued a letter of resignation. Miller replied, "James Mattis is retiring."
"At the same time, as Mattis said in the letter, the President has a Secretary of Defense who has done so. Strong agreement with his views," Miller said, adding later: "It is quite at this point in the administration as well normal, to have sales. "
Miller also expressed Blitzer's reference to the Republican criticism of Trump's decision over Syria, including out of Sens. Lindsey Graham of South Carolina and Marco Rubio of Florida.
"Some of the voices you're talking about, like our dear friend Lindsey Graham, whom we like very much, have been wrong about politics in the Middle East, wrong about Iraq," said Miller.
Meanwhile, several legislators of both parties complain Mattis' farewell.
Just read the resignation letter from General Mattis: "Rubio has tweeted." It shows that we are facing a series of grave political mistakes that will endanger our nation, damage our alliances and strengthen our opponents.
Senator Richard Blumenthal of Connecticut later told Blitzer that he and his colleagues in the Senate are betting on Mattis in an otherwise turbulent administration.
"When we said in the Armed Services Committee or in the Senate that we are deeply troubled and worried about an irritable and unpredictable administration, we could assure ourselves and the nation that there was a strong and stable expert, a patriot standing between the president and the use of military force, "said Blumenthal. [1
" It is just a fear that the adults in the room, the experts … they go, and that makes us less sure, "added Swalwell."