At the congressional luncheon, Trump asks those in attendance to stand for Hillary Clinton.
Our correspondent Mike Eckel sent this video footage of fresh clashes between police and protesters.
Protesters setting fires in trash cans and newspaper boxes out front of the Washington Post.
Police now saying they have arrested 95 people during anti-Trump protests in Washington.
At the inaugural luncheon at the Capital, President Donald Trump walked to Hillary Clinton's table and shook the hand of the defeated Democratic nominee.
More video footage of today's protests by our correspondent Mike Eckel.
More reporting on the latest clashes between protesters and police.
Here's a fresh item from our news desk:
Trump White House Vows 'Peace Through Strength,' Missile Defense
New U.S. President Donald Trump's administration says that defeating Islamic State "and other radical Islamic terror groups" will be the highest priority of an "America first" foreign policy centered on "peace through strength."
A foreign policy statement posted on the White House website on January 20, shortly after Trump was sworn in, said that the United States will "pursue aggressive joint and coalition military operations when necessary" to achieve that goal.
https://www.whitehouse.gov/america-first-foreign-policy
It also promised to "rebuild the American military," saying that the Army and Navy are substantially smaller than they were in 1991 and that Trump "is committed to reversing this trend."
It also included a vow to "embrace diplomacy," saying: "The world must know that we do not go abroad in search of enemies, that we are always happy when old enemies become friends, and when old friends become allies."
A separate statement focusing on the military said the United States "cannot allow other nations to surpass our military capability" and "will pursue the highest level of military readiness."
https://www.whitehouse.gov/making-our-military-strong-again
It said the United States will "develop a state-of-the-art missile defense system to protect against missile-based attacks from states like Iran and North Korea."
It did not say whether the system would differ from those in place or under development, including a European missile shield that Russia has vociferously opposed.
Turning to trade, the statement said the United States will seek to bolster its economy by "fighting for fair but tough trade deals" and will start by withdrawing from the Trans-Pacific Partnership.
With reporting by Reuters
The Washington Post reports police used stun grenades to push back against protesters.