$14.9 billion bid for the U.S. Steel citing national security concerns, two sources familiar with the situation told Reuters. Nippon Steel agreed to acquire U.S. Steel last year, but has faced resistance since then from both an assertive labor union and the White House.">

U.S. Steel's proposed $14.9 billion merger with Nippon Steel

The logo of Nippon Steel Corporation is displayed at the company headquarters in Tokyo · Reuters

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(Corrects to add Timeline tag in headline, change dateline to Sept 5 from May 30)

(Reuters) -The White House is set to announce that President Joe Biden will block Nippon Steel's < 5401.T> $14.9 billion bid for the U.S. Steel citing national security concerns, two sources familiar with the situation told Reuters.

Nippon Steel agreed to acquire U.S. Steel last year, but has faced resistance since then from both an assertive labor union and the White House.

Here's a timeline of events leading up to the deal between the two steelmakers and the growing bipartisan political opposition:

DATE DEVELOPMENT

Aug. 13, U.S. Steel announces aim to explore options

2023 after receiving unsolicited bids, ranging

from the acquisition of certain production

assets to consideration for the company

Aug. 13, U.S. Steel rejects a $7.3-billion offer from

2023 Cleveland-Cliffs, leading to the start of a

formal review of its strategic options

Aug. 14, The United Steelworkers union supports

2023 Cleveland-Cliffs' bid to acquire U.S. Steel,

saying the company is the best buyer

Aug. 14, Shares of U.S. Steel rise after privately

2023 held firm Esmark makes a $7.8-billion

all-cash offer for the company

Aug. 16, ArcelorMittal, the world's second-largest

2023 steelmaker, considers a potential offer for

U.S. Steel, Reuters reports

Aug. 17, U.S. Senator J.D. Vance asks U.S. Steel to

2023 rule out a foreign buyer for the company

Aug. 17, U.S. Steel says its labor agreement with USW

2023 does not grant the union the right to veto a

potential sale of the company

Aug. 22, Cleveland-Cliffs demands U.S. Steel reveal

2023 all buyout offers it has received

Aug. 23, Esmark withdraws its bid for U.S. Steel,

2023 respecting the position of the USW union,

which supports Cleveland-Cliffs' offer

Aug. 29, U.S. Steel begins due-diligence after

2023 entering agreements with numerous third

parties

Sept. 20, U.S. Steel and Cleveland-Cliffs clash over a

2023 confidentiality pact

Sept. 21, Canada's Stelco Holdings considers a bid for

2023 U.S. Steel, Bloomberg news reports

Sept. 28, U.S. Steel allows Cleveland-Cliffs to

2023 participate in its sale process

Oct. 31, Major automakers oppose Cleveland-Cliffs'

2023 proposed acquisition, citing potential cost

increases and a slowdown in electric-vehicle

sales

Dec. 18, Japan's Nippon Steel announces its plan to

2023 buy U.S. Steel in a deal valued at $14.9

billion

Dec. 19, Three U.S. Republican senators urged

2023 Treasury Secretary Janet Yellen to block the

deal by Nippon Steel, citing national

security concerns.

Dec. 20, Brian Deese, a key player in President Joe