President Donald Trump was set to dine Tuesday night with an executive from a top cloud competitor of Amazon.com Inc., the company that he had raged against in recent days.

Oracle Corp. ORCL, -0.32% Co-Chief Executive Safra Catz was to be joined by venture capitalist Peter Thiel at the dinner, Bloomberg News reported.

Oracle is competing with Amazon AMZN, +5.69% for a multi-billion-dollar cloud-computing contract with the Pentagon. Only one company will get the contract, and Microsoft Corp. MSFT, +2.40% , International Business Machines Inc. IBM, +0.21% and tech industry groups representing Oracle, among others, have complained that the bidding process favors Amazon Web Services.

On Monday, Vanity Fair reported Trump was at “war” with Amazon, and that advisers were suggesting he not let Amazon get the cloud contract. In recent days, Trump has assailed Amazon in a series of tweets, complaining about its contract with the U.S. Postal Service in particular. After falling about 5% Monday, Amazon shares gained 1.5% Tuesday.

Catz was reportedly on the short list to replace Lt. Gen. H.R. McMaster as Trump’s national security adviser, before Trump chose John Bolton for that role last month. Catz was part of Trump’s transition team in 2016, and last year had been rumored to be joining the Trump administration.

Thiel, who co-founded PayPal Holdings Inc. PYPL, +2.49% and is on the board of directors of Facebook Inc. FB, +2.66% , is among Trump’s biggest supporters from Silicon Valley, and praised Trump’s nomination at the 2016 Republican National Convention.

In February, Thiel said he was moving to Los Angeles because San Francisco was too liberal.