NPR News

The nation's top military officer, Gen. Martin Dempsey, is in Israel where he's expected to send a clear message: Don't attack Iran and let the tougher sanctions take hold.

Gen. Dempsey's trip to Israel was scheduled weeks ago, but it comes at a particularly sensitive time. Iran has threatened to close the Strait of Hormuz, the key route for oil shipments, and has stepped up its naval activities.

An Iranian nuclear scientist was recently killed by a drive-by assassin, and Iran is blaming Israel.

Mitt Romney's tax returns and the tax rate he paid on his income have been hot issues in the recent Republican primaries.

"What's the effective rate that I've been paying? It's probably closer to the 15 percent rate than anything because my last 10 years, my income comes overwhelmingly from investments," he recently told reporters.

So why does a multimillionaire pay just 15 percent on his income? After all, the top income tax rate is 35 percent and many middle-class people pay over 20 percent.

There are reports Thursday that Texas Gov. Rick Perry will leave the GOP presidential race, and Iowa officials announced final results of the state's Republican presidential nominating caucuses held earlier this month.