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As Donald Trump continues to win primaries across the country, his amorphous coalition grows. White voters propelled a Hillary Clinton win in Ohio, while black voters helped her take Illinois.

Last night's presidential debate focused on economic issues. Our reporters look at candidate claims about business creation, the minimum wage, trade and the length of the tax code.

The Florida senator was supposed to be one of the emerging leaders of the Republican Party. But his leadership role on the immigration overhaul has brought a lot of criticism from his party's anti-amnesty base. His experience illustrates the divides in the current GOP.

Florida Sen. Marco Rubio, a potential Republican presidential candidate, has transformed from hero to suspect in the eyes of many on the right.

The extra scrutiny given to some conservative groups' applications for tax-exempt status has sparked outrage. Acting IRS Commissioner Steven Miller blames "shortcuts," not politics. He and other IRS officials didn't alert Congress to what was happening when they could have last year.

Groups that focused on issues such as government spending, taxes and making America "a better place to live" were given extra scrutiny when they applied for tax-exempt status, according to news reports. That's in addition to the "tea party" and "patriot" groups the IRS has apologized for singling out.

In his new role as president of the Heritage Foundation, the former South Carolina senator parts company with a conservative Senate ally on the subject of immigration.

Florida Sen. Marco Rubio is working to tamp down conservative backlash to the Senate's immigration bill, which he helped craft. Radio talk show hosts, Tea Party activists and conservative bloggers are concerned that Rubio and other Republicans are giving away too much on an issue they believe mostly helps Democrats.

Bipartisan bonhomie broke out Thursday afternoon when four Democratic and four Republican senators made a case for their comprehensive immigration overhaul proposal. "America is an idea; nobody owns it," said Sen. Lindsey Graham, R-S.C. "We've got to create order out of chaos."

It's still far too early to know whether Congress will be able to achieve major changes to the nation's immigration laws. All that's certain at this stage is that lawmakers on both sides of the partisan divide, and in both chambers, continue to act as though they think they can.