WASHINGTON (Reuters) -The U.S. Justice Department is considering suing to block Korean Air's planned acquisition of Asiana Airlines, Politico reported on Thursday.

The U.S. Department of Justice has been investigating the November 2020 deal for roughly two years, and is concerned that it will hurt competition on overlapping routes to the United States, the report said citing three people with knowledge of the deliberations.

In response to the report, Korean Air said the Justice Department had not made any official decision, adding the South Korean airline would continue its dialogue with the U.S. government until a final decision is made.

"Korean Air has made, and continues to make, every effort to obtain all necessary approvals," the company said in a statement to Reuters.

A Justice Department spokesman declined to comment.

The U.S. administration is concerned the merger would place too much control of cargo transportation of key goods like microchips in the hands of one company, the report said, adding that no decision has been made on whether to bring a case.

EU antitrust regulators said on Wednesday that Korean Air Lines' proposed acquisition of rival Asiana may restrict competition in passenger and cargo air transport services between Europe and South Korea.

The merger between South Korea's no.1 and no.2 airlines would see Korean Air become the biggest shareholder in indebted Asiana. The deal was arranged by Asiana's creditors led by state-run Korea Development Bank in 2020.

The Biden administration has taken a hard line on airline consolidation.

In March, the Justice Department filed suit to stop JetBlue Airways Corp from buying Spirit Airlines Inc, saying the planned $3.8 billion merger "will lead to higher fares and fewer seats, harming millions of consumers on hundreds of routes." Trial is set for October.

The department also sued asking a judge to force JetBlue and American Airlines to scrap their Northeast Alliance. The companies are awaiting a decision after a trial last year.

(Reporting by Kanjyik Ghosh in Bengaluru, David Shepardson in Washington and Joyce Lee in Seoul; Additional reporting by Editing by Leslie Adler and Sonali Paul)