Defense Secretary James Mattis on Wednesday confirmed to lawmakers that President Trump has given him authority to set troop levels in Afghanistan, but said any new additions to U.S. forces there haven’t been decided.

“At noon yesterday, President Trump delegated to me the authority to manage troop numbers in Afghanistan,” Mattis said in his opening remarks at a Senate Appropriations defense subcommittee hearing.

Mattis said the decision does not immediately change U.S. troop levels, now at 8,400 in Afghanistan, and the decision does not signal a broader change in military strategy there.

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Mattis added that the Pentagon is working on a broad Afghanistan policy to be sent to Trump in several weeks. He added that the troop levels will be consistent with Trump's “strategic direction and foreign policy.”

Trump delegated the authority “at the end of a very long discussion, months of discussion,” Mattis said.

The former U.S. Central Command head would not say how many more troops were likely to be sent to help end the 16-year war in Afghanistan, but he will brief Congress on the number within "weeks."

Mattis assured lawmakers that he had not “been given some carte blanche to draw up ... a number that’s out of step with the strategy.”

Under questioning from Sen. Jack Reed John (Jack) Francis ReedWhen 'Buy American' and common sense collide Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (D-R.I.), Mattis also revealed several details on meetings with Trump on military movements in the Middle East that were also attended by Secretary of State Rex Tillerson, CIA Director Mike Pompeo and National Intelligence Director Dan Coats Daniel (Dan) Ray CoatsFBI chief says Russia is trying to interfere in election to undermine Biden The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Former Intel chief had 'deep suspicions' that Putin 'had something on Trump': book MORE.

“I don’t keep any secrets from the president,” Mattis said. “There are frequent meetings, we go into a great deal of detail, and the president is keenly interested – not in all the tactical details – but getting the strategy right and knowing enough of the tactical detail that he’s informed.”

“He is a very active participant when we sit down with him,” Mattis said.

Sen. Dick Durbin Richard (Dick) Joseph DurbinThe Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Feinstein 'surprised and taken aback' by suggestion she's not up for Supreme Court fight Grand jury charges no officers in Breonna Taylor death MORE (D-Ill.) pressed Mattis on what the additional troops would do to help end the years-long conflict.

“What are the likely prospects that sending more military troops, risking more American lives, spending billions more in dollars, will make any difference 16 years from now than it has for the first 16 years?” Durbin asked.

Mattis said that the Pentagon has changed priorities and will focus on “a more regional construct” in battling extremist groups.

“We consider things, issues from India and Pakistan all the way over to Iran because they're the bordering nations. And ignoring those means you put in a strategy that has not taken into account some of the most fundamental factors that would impact on its success or failure," he said.

Mattis's comments Wednesday came a day after he told lawmakers that the U.S. is “not winning” in Afghanistan “and we will correct this as soon as possible.”

The defense chief also promised to brief Congress in detail on a new strategy for Afghanistan by mid-July.

The U.S. troops currently in Afghanistan are on a dual mission of training, advising and assisting Afghan troops in their fight against the Taliban and conducting counterterrorism missions against groups such as al Qaeda and the Islamic State in Iraq and Syria (ISIS).

Trump is soon to decide on a request to send 3,000 to 5,000 more U.S. troops to the country.

Updated: 1:28 p.m.