WASHINGTON (AP) — The Latest on Campaign 2016 two days before voters in Rhode Island, Pennsylvania, Connecticut, Delaware and Maryland cast votes for their presidential nominees (all times Eastern Daylight Time):

10:00 p.m.

The presidential campaigns of Texas Sen. Ted Cruz and Ohio Gov. John Kasich say they are launching collaborative strategies to deprive Donald Trump the delegates needed to win the Republican nomination.

Both Cruz and Kasich's campaigns released statements Sunday saying that Cruz will focus his campaign resources on winning enough delegates in Indiana, while Kasich will focus his efforts on western states including Oregon and New Mexico.

Trump, the current front-runner, needs 1,237 delegates to win the Republican nomination. If he falls short, the Republican convention in July will evolve into a rare contested convention.

Trump has repeatedly denounced the system, saying he should win the nomination even if he falls slightly short of the majority — something officials with the Republican National Committee have ruled out.

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7:50 p.m.

Democratic presidential candidate Bernie Sanders is resuming his call for rival Hillary Clinton to release the transcripts of her lucrative speeches to Wall Street after she left the State Department.

Sanders says in New Haven, Connecticut, that his campaign, "unlike Secretary Clinton's" has not raised $15 million from Wall Street "and millions more from other special interests." He says he hasn't given speeches on Wall Street behind closed doors for $225,000 a speech.

Sanders says he would like to address Wall Street bankers "to their face" and tell them that their greed has destroyed the lives of many Americans.

He tells thousands of supporters near Yale University that he has his "cellphone on and I am awaiting that phone call from Wall Street" inviting him.

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6:30 p.m.

Republican presidential front-runner Donald Trump is accusing rival Ted Cruz of bribing delegates to the national convention to build support for Cruz's candidacy.

Trump offered no evidence to back up his accusation while campaigning in Maryland, one of a handful of states that will be voting Tuesday.

Speaking in an airplane hangar in Hagerstown on Sunday evening, Trump repeatedly stressed that he expects to win the number of delegates needed to land the nomination on the first ballot at July's national convention.

"I think we get that 1,237," he says. "I'm pretty sure."

Cruz has badly outmaneuvered Trump by ensuring that supportive delegates make it to the convention. Trump has repeatedly slammed the system as "rigged."

Cruz and rival John Kasich are hoping to force a contested convention in which delegates would be free to support them after the first ballot.

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1:20 p.m.

Democratic presidential candidate Bernie Sanders is urging Hillary Clinton to join him in support of a tax on carbon emissions to curb climate change and support universal health care.

Sanders is addressing more than 7,000 people at a Providence, Rhode Island, park ahead of the state's primary on Tuesday.

Sanders says if the former secretary of state is "concerned about climate change" she should join him in pushing for a tax on carbon.

He also says Clinton and the establishment don't think the nation has "the guts" to take on the insurance and drug industries to provide universal health care.

Rhode Island allows independents to participate in the Democratic contest and Sanders' campaign hopes the senator's message will power him past Clinton in the primary.

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12:05 p.m.

Billionaire Charles Koch says he doesn't anticipate spending money on supporting or opposing the Republican presidential nominee — and he's leaving open the prospect that Hillary Clinton might be preferable to anyone currently seeking the GOP nod.

He says the candidate has to be liked as much as Ronald Reagan and "compete on making the country better" rather than tearing down opponents. Donald Trump, Ted Cruz and John Kasich, he said on ABC's "This week," ''are terrible role models." He denies giving money to efforts to oppose Trump.

Koch also said "it's possible" that Hillary Clinton would be better than a Republican. But he says that he'd "have to believe her actions would be quite different than her rhetoric." The same standard, he said, goes for Republicans.

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12:00 p.m.

Hillary Clinton is reflecting on the life of Harriet Tubman in a Philadelphia church.

At Triumph Baptist Church in North Philadelphia on Sunday, Clinton praised the abolitionist for the "contributions she made to our freedom," and evoked the image of a "feisty determined woman leading slaves to freedom."

It was announced this week that that Tubman would be featured on the $20 bill. Clinton said she had visited Tubman's upstate New York home during her time as that state's senator.

Before the largely African-American congregation, Clinton also promised to work on reforming the criminal justice system and pledged to do "everything I can to take on the gun lobby."

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10:30 a.m.

Donald Trump's chief political adviser says "we're evolving the campaign, not the candidate" — adding policy speeches for a front-runner whose style has been heavy on bombast.

Paul Manafort tells "Fox News Sunday" that Trump is paying more attention to the political nuts and bolts — from counting delegates and working with party leaders.

Manafort also contends that his recorded comments at a GOP gathering last week — when he told party leaders Trump was "playing a part" onstage — were taken out of context.

Trump told supporters on Saturday that "being presidential's easy," and that he's got "to rant and rave" at rallies or people "will fall asleep."

Trump said he has no intention of reversing his provocative proposals, including building a wall along the Mexican border.