WASHINGTON -  US President Barack Obama on Thursday sent a request to Congress for an additional $11.6 billion in supplemental war-related funding, which would include money to fight Islamic State militants and sustain high overseas troop levels.

The request, detailed in a letter released by the White House, seeks an additional $5.8 billion for the Pentagon for military operations in Afghanistan and fighting Islamic State in Iraq and Syria, and an $5.8 billion for the State Department and United States Agency for International Development (USAID) for fiscal 2017.

Obama made the request just before Congress returns to Washington for its “lame duck” session before the new Congress starts in January.

“For the Department of Defence, this plan reflects the evolving nature of our military campaign against ISIL and our efforts in Afghanistan,” US Secretary of Defence Ash Carter said in a statement, using an acronym for Islamic State.

Carter added that the funding would also allow the State Department and USAID to counter extremism. “Swift passage of this plan will help the Department of Defence and our partners in the US government and around the world protect this nation, and I urge Congress to support it,” the statement said.  US Representative Mac Thornberry, the chairman of the House of Representatives Armed Services Committee, said he would review President Barack Obama’s request but that it was too low.

“While we will review the request carefully, the amount still does not accommodate the increased pace of operations against ISIL and does nothing to begin addressing the readiness crisis,” Thornberry said in a statement.

Meanwhile, the United States is continuing to reinforce its military forces in Europe as planned, irrespective of President-elect Donald Trump’s future intentions, the Pentagon said Thursday.

Trump, who will take office in January, raised serious concerns in Europe by promising during his campaign that US engagement in NATO under his presidency would be conditional on members’ payments to the alliance.

Washington is scheduled to start deploying an additional combat brigade in Europe in February to bring the number of brigades on the continent to three.

The plan is part of an effort to boost Eastern European defences against possible attack by Russia.

“We are executing plans as they were constructed with our NATO allies,” Pentagon spokesman Peter Cook said.

“We leave it to the next administration to speak their policy choices,” he added. “We have one commander-in-chief at a time.”

The new brigade is set to begin its deployment with an exercise in Poland before sending companies to Bulgaria, Romania and the Baltic States.

Trump, who has praised Russian President Vladimir Putin, has criticized President Barack Obama’s policy toward Moscow, saying he wants to improve relations.

Asked about the possibility that the current defence secretary, Ash Carter, would remain in office under Trump, Cook declined to comment on what he called “hypothetical” situations.

Carter “is focused on his job right now and he wants to serve this president until the end of his term,” he said.