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Trump's tax plan, Apple's iPhone sales, and Viacom pins hopes on new Daily Show

U.S. stocks are starting the week in the red with the major indices (^DJI, ^GSPC, ^IXIC) all trading about a percent lower. The culprits are familiar ones; concerns over the timing of the Fed's rate hike and a general lack of global economic growth. Energy, healthcare and materials are the greatest drags on the S&P 500 today with biotech weighing heavily on the Nasdaq. 25 of the 30 Dow components are trading lower as well.

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Here are some of the other stories Yahoo Finance is keeping an eye on today.

Donald Trump's tax plan
The Republican front-runner announced his much teased tax plan earlier today. The highlights of the plan include tax cuts for millions in the middle class, a lower rate for all business and a one time 10 percent levy on all overseas profits.

Apple's iPhone sales record
Apple (AAPL) says it shattered its previous first weekend iPhone sales record by moving some 13 million new iPhone 6Ss and 6S Pluses since Friday's launch. Despite the numbers, shareholders seem unimpressed; the company's stocks is trading lower today by about a percent.

Whole Foods to cut 1,500 workers
Whole Foods (WFM) is planning to cut 1,500 jobs over the next eight weeks. The upscale grocery chain said that the cuts are aimed at reducing costs as the company invests in technology upgrades. The stock isn't moving much on the news, down less than half a percent.

Viacom's great comedic hope
The Daily Show with Trevor Noah premieres tonight, and while the show will normally air on Comedy Central, Viacom (VIAB) pans to simulcast the debut across all of its networks, including VH1 and MTV. Can one show save a lagging, once great media empire?