Trump vows military build-up, hammers nationalist themes

• Trump rescinds transgender bathroom rules from Obama era
• Trump's new security advisor differs from him on Russia, other key issues
• Outspoken general named Trump's top security adviser
• Afghan training goes back to basics as Trump faces U.S. troop decision

Trump used remarks to the Conservative Political Action Conference (CPAC), an organization that gave him one of his first platforms in his improbable journey to the U.S. presidency, to defend his unabashed "America first" policies.

Ahead of a nationally televised speech to Congress on Tuesday, Trump outlined plans for strengthening the U.S. military, already the world's most powerful fighting force, and other initiatives such as tax reform and regulatory rollback.

U.S. President Donald Trump addresses the American Conservative Union's annual Conservative Political Action Conference (CPAC) in National Harbor, Maryland. U.S., February 24, 2017. REUTERS/Kevin Lamarque

He offered few specifics on any initiatives, including the budget request that is likely to face a harsh reality on Capitol Hill: At a time when he wants to slash taxes for Americans, funding a major military buildup without spending cuts elsewhere would add substantially to the U.S. budget deficit.

Trump said he would aim to upgrade the military in both offensive and defensive capabilities, with a massive spending request to Congress that would make the country's defense "bigger and better and stronger than ever before."

"And, hopefully, we’ll never have to use it, but nobody is going to mess with us. Nobody. It will be one of the greatest military buildups in American history," Trump said.

Appealing to people on welfare to go to work and pledging to follow through on his vow to build a wall on the U.S.-Mexican border, Trump drew rounds of applause from the large gathering of conservatives, many of them wearing hats emblazoned with the president's campaign slogan, "Make America Great Again."

His speech was heavy on the nationalist overtones from his campaign last year, focusing on promises to boost U.S. economic growth by retooling international trade deals, cracking down on immigration and boosting energy production.