Florida Sen. Marco Rubio trails Donald Trump in the polls ahead of tonight's debate in Miami and next week's winner-take-all Florida primary next week. The fading Rubio was third in the delegate count, behind Trump and Texas Sen. Ted Cruz. (USA Today)

Across a wide range of industries, CFOs have conceded Trump will be the Republican candidate for president. That's according to the latest CNBC Global CFO Council survey, conducted between Feb. 25 and March 8. The CFOs see Hillary Clinton as the Democratic nominee.

GOP presidential front-runner Donald Trump joins CNBC's "Squawk Box" at 8 a.m. ET this morning. And then at 8:40 a.m. ET, we talk to former Republican candidate Carly Fiorina, who just endorsed Cruz.

Following his upset victory in Michigan, Sen. Bernie Sanders clashed with Hillary Clinton on immigration during last night's Miami debate. Univision host Jorge Ramos pressed Clinton on whether she'd drop out of the race if the private email investigation were to result in her indictment. Meanwhile, one of the biggest topics on Twitter from the debate was whether Sanders was wearing a brown suit. (NBC News & NY Times & USA Today)

Square (SQ) reported a wider-than-expected loss in its first quarter as a publicly traded company. But revenue at the mobile payments firm was well above estimates. Square co-founder and CEO Jack Dorsey told CNBC: "We need to constantly show we're focused on the right things."

Dorsey is also co-founder and CEO of Twitter (TWTR), which is said to be sweetening its employee compensation packages to stem a talent drain, a pressing move that may be followed by other tech companies with sinking stock prices. (WSJ)

Twitter co-founder Biz Stone joins CNBC's "Squawk Box" at 8:15 a.m. ET this morning, as the social network seeks to overcome Wall Street concerns. Twitter celebrates its 10th anniversary this month.

Volkswagen's (VLKAY) U.S. head, Michael Horn, six months after the automaker's diesel emissions cheating scandal became public. North American regional chief Hinrich Woebcken replaces Horn on an interim basis. (Reuters)

Honda (HMC) is going to compensate U.S. dealers for losses related to vehicles they cannot sell because of the massive recall linked to potentially faulty airbags made by Takata Corporation. The plan, still being finalized, is set to go into effect this month. (Automotive News)

John Gutfreund, renowned in the world of finance, died Wednesday at age 86. Gutfreund made his name in the Treasury securities market at Salomon Brothers, making big wagers to grow the firm to a dominant force and eventually taking the company public. (WSJ)