WASHINGTON (AP) — The latest developments in the 2016 campaign for the presidency. All times EDT:

11:58 a.m.

Senate Minority Leader Harry Reid has congratulated Democratic presidential nominee Hillary Clinton on becoming the presumed Democratic presidential nominee.

That's the word Thursday from the Democrat's office. Reid had endorsed Clinton several weeks ago. The senator was meeting with Clinton's rival, Vermont Sen. Bernie Sanders, on Thursday as Democrats press for unity after a hard-fought primary campaign.

Party leaders recognize that the process won't be easy. The top Democrat in the House, Nancy Pelosi, acknowledged that on Thursday.

"People have their hopes and dreams, their aspirations riding on a candidate. And sometimes it's really harder for the supporters to come to reconciliation than it is the candidate," Pelosi told reporters. "Bernie Sanders knows what's at stake in this election, what's on the line. I have no doubt that he'll be very constructive as we go forward."

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11:38 a.m.

President Barack Obama and Bernie Sanders are meeting in the Oval Office.

Obama greeted Sanders as he arrived at the White House and the two walked past the sun-bathed Rose Garden — and a pack of snapping cameras — to their private meeting.

The president and Sanders could be seen chatting warmly and laughing as they strolled along the colonnade. Obama was expected to talk about ways Sanders can keep up the fight for his policy agenda, but not his bid for the presidency.

All the scrutiny around the meeting with the president didn't appear to faze the Vermont senator. Ever the everyman, Sanders stopped for coffee and a scone at a Peet's coffee shop across from the White House before arriving.

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11:25 a.m.

Senate Democrats are unveiling a reform agenda that proposes new curbs on campaign finance spending and a permanent ban on lobbying by former members of Congress.

The "We the People Act" also would prohibit financial services companies from paying bonuses to executives who leave the private sector to take high-level jobs in the government.

The agenda touches on some of the issues and themes that Sen. Bernie Sanders has talked about in his presidential campaign. Democrats led by Sen. Chuck Schumer of New York were unveiling it on the same day that Sanders is visiting the White House and Capitol Hill for meetings with President Barack Obama and Senate Minority Leader Harry Reid.

Senators now have a two-year ban on lobbying after leaving office, and House members a one-year ban.

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11:10 a.m.

Bernie Sanders has arrived at the White House to discuss the future of his presidential bid with President Barack Obama.

Sanders and Obama are due to talk privately in the Oval Office. Sanders' wife, Jane, accompanied him.

The White House says the Vermont senator requested the meeting. Obama plans to talk about ways Sanders can keep up the fight for his policy agenda, but not his bid for the presidency.

Obama is expected to formally endorse Hillary Clinton shortly after the meeting.

Obama's endorsement will add to a growing chorus of Democratic leaders pushing Sanders to step aside so the party can focus on taking on Republican Donald Trump.

The president last spoke with Sanders Tuesday night, shortly after Clinton declared victory in the long primary.

The men are not known to have much of a personal relationship. But the White House says they've spoken more frequently in recent weeks. The White House says this will be their fourth conversation in the last month.

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10:12 a.m.

Democratic presidential candidate Bernie Sanders has landed outside Washington for meetings with President Barack Obama at the White House and with Senate Democratic leader Harry Reid on Capitol Hill.

Sanders faces questions about whether he will back Clinton and when he may end his bid. He lost four of six contests in Tuesday's primaries and Hillary Clinton is now the Democrats' presumptive nominee.

But Sanders has vowed to campaign through Tuesday's final primary in the District of Columbia and pursue a contested Democratic convention in Philadelphia.

Sanders was headlining a D.C. rally and then returning home to Vermont on Thursday night.

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3:13 a.m.

On the verge of endorsing Hillary Clinton, President Barack Obama will pay tribute to Bernie Sanders' historic candidacy for presidency with an Oval Office meeting. The session is aimed at unifying the Democratic Party for a general election brawl with Donald Trump.

Sanders heads to the White House under intense pressure to drop out and clear the way for Clinton. Though he showed signs he understood the end was near, he's vowed to keep fighting for his movement.

Obama has sought to give the Vermont senator the courtesy of exiting the race on his own terms, but is expected to formally endorse Clinton after the meeting. The White House says he plans to use the meeting to discuss how to build on the enthusiasm Sanders brought to the primary.