House Armed Services Committee Democrats dinged President Trump’s executive order Friday that Trump claims will begin a "great rebuilding" of the military, saying that expanding the armed forces is Congress’s job.

“Fun fact: Under Article 1, Section 8 of the Constitution, Congress has the exclusive power to rebuild the military,” the Armed Services Democrats’ Twitter account tweeted, linking to a page with the text of the section of the Constitution that gives Congress the power to “provide for the common defense.”

Fun fact: Under Article 1, Section 8 of the Constitution, Congress has the exclusive power to rebuild the military https://t.co/ASLd6QYquq — House Armed Services (@HASCDemocrats) January 27, 2017

Trump visited the Pentagon on Friday to sign an executive order that he said will “begin a great rebuilding of the armed services of the United States, developing a plan for new planes, new ships, new resources and new tools for our men and women in uniform.”

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The order, released Friday night by the White House, calls for rebuilding to military to pursue "peace through strength," a slogan Trump used in the campaign.

Under the order, Defense Secretary James Mattis will have to prepare a 30-day “readiness review” that assesses training, equipment maintenance, munitions, modernization and infrastructure, and identifies actions to be taken this year.

Mattis will also have to 60 days to submit a plan to improve readiness by fiscal 2019.

The order also calls for the Pentagon and the Office of Management and Budget (OMB) to craft a budget amendment to boost military spending this year. Mattis and OMB will also need to create a fiscal 2018 budget that has levels "necessary to improve readiness conditions and address risks to national security," the order says.

Adding more troops and equipment to the military — a long-time goal for defense hawks and a Trump campaign promise — would require Congress to lift caps on defense spending.

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Lifting the caps could prove difficult if fiscal conservatives opposed to new spending and Democrats who want parity between defense and nondefense spending unite to oppose the plans.

Updated at 7:38 p.m.