Alex Ossola

Plus, how Apple is using lower prices on iPhones and MacBooks to go after market share and hurt its rivals.

And U.S.

stocks plunge as the Middle East conflict widens and the region's flow of oil remains blocked.

It's Thursday, March 5th.

I'm Alex Oselev for The Wall Street Journal.

This is the PM edition of What's News, the top headlines and business stories that move the world today.

President Trump has removed Kristi Noem as a secretary of Homeland Security, the first cabinet secretary to be fired by Trump in his second term.

Trump is replacing her with Republican Senator Mark Wayne Mullen of Oklahoma.

Trump had previously defended Noem, despite widespread criticism of how she handled the immigration enforcement operation in Minneapolis that left two U.S.

citizens dead.

Her chaotic leadership style has come under scrutiny over the past year, and she had lost the confidence of almost all Trump's senior aides.

The Journal last month reported on how Noem has attempted to burnish her personal stardom.

Advisors familiar with Trump's thinking said that the final straw for the president was Noem's combative hearing on Tuesday before the Senate Judiciary Committee.

She was questioned by Senator John Kennedy, a Republican from Louisiana.

Yes, sir.

We went through the legal processes.

Did it correct?

Did the president know you were going to do this?

Yes.

Yes.