WASHINGTON (AP) — Supporters of President Donald Trump rallied in Washington on Saturday voicing concern over what they say was a stolen election. Some swarmed his motorcade when he detoured for a drive-by on his way out of town.

“I just want to keep up his spirits and let him know we support him,” said Anthony Whittaker of Winchester, Virginia.  He was among supporters standing outside of the Supreme Court, where thousands assembled after a march along Pennsylvania Avenue from Freedom Plaza, near the White House.

A week after the presidential race was called for Democrat Joe Biden, Mr. Trump’s supporters remain angry at the prospect of a transfer of executive power.

A broad coalition of top government and industry officials has declared that the Nov. 3 voting and the following count unfolded smoothly with no more than the usual minor hiccups — “the most secure in American history,” they said.

The crowd was beginning to gather in the morning when cheers rang out as Pres. Trump’s limousine neared Freedom Plaza. People lined both sides of the street. Some stood just a few feet away from Pres. Trump’s vehicle; others showed their enthusiasm by running along with the caravan.

They chanted “USA, USA” and “four more years,” and many carried American flags and signs to show their displeasure of the vote tally. After making the short detour for the slow drive around the site, the motorcade headed to the president’s Virginia golf club.

Among the speakers was a Georgia Republican newly elected to the U.S. House. Marjorie Taylor Greene urged people to march peacefully toward the Supreme Court.

The marchers included members of the Proud Boys, a far-right, all-male, anti-immigrant group known for street brawling with ideological opponents at political rallies.

The demonstration was largely peaceful, with some tension along the margins as counterdemonstrators heckled the marchers with chants of “You lost!”

The “Million MAGA March” was heavily promoted on social media, raising concerns that it could spark conflict with anti-Trump demonstrators, who have gathered near the White House in Black Lives Matter Plaza for weeks.

In preparation, police closed off wide swaths of downtown, where many stores and offices have been boarded up since Election Day. Chris Rodriguez, director of the city’s Homeland Security and Emergency Management Agency, said the police were experienced at keeping the peace.

The election issues that Pres. Trump’s campaign and its allies have pointed to are typical in every election: problems with signatures, secrecy envelopes and postal marks on mail-in ballots, as well as the potential for a small number of ballots miscast or lost.

Pres. Trump’s campaign has also filed legal challenges complaining that their poll watchers were unable to scrutinize the voting process. Many of those challenges have been tossed out by judges, some within hours of their filing.

A former administration official, Sebastian Gorka, whipped up the crowd by the Supreme Court by saying, “We can win because he did win.” But, he added, “It’s going to be tough.”