BRUSSELS, Feb 23 (Reuters) -

U.S. House Judiciary Chair Jim Jordan on Sunday demanded EU

antitrust chief Teresa Ribera clarify how she enforces the

European Union's rules reining in Big Tech, saying they appear

to target U.S. companies.

The request came two days after U.S. President Donald Trump

signed a memorandum warning that his administration would

scrutinise the EU's Digital Markets Act and the Digital Services

Act "that dictate how American companies interact with consumers

in the European Union".

The Digital Markets Act sets out a list of dos and don'ts

for Alphabet, Amazon ( AMZN ), Apple ( AAPL ),

Booking.com, ByteDance, Meta Platforms ( META ),

Microsoft ( MSFT ), aimed at securing a level playing field and

giving consumers more choices.

"We write to express our concerns that the DMA may

target American companies," Jordan wrote in a letter sent to

Ribera on Sunday and seen by Reuters, saying that the rules

subject companies to burdensome regulations and give European

companies an advantage.

He criticised fines up to 10% of global annual revenues for

DMA violations.

"These severe fines appear to have two goals: to compel

businesses to follow European standards worldwide, and as a

European tax on American companies," Jordan said.

He also took a swipe at the DMA requirements, saying some of

them could benefit China.

"These, along with other provisions of the DMA, stifle

innovation, disincentivize research and development, and hand

vast amounts of highly valuable proprietary data to companies

and adversarial nations," Jordan said.

He urged Ribera to brief the judiciary committee by March

10.

The European Commission, where Ribera is the second most

powerful official after its president, Ursula von der Leyen, has

denied taking aim at American companies.

Ribera in an interview with Reuters last Monday said the EU

executive should not be pushed into making changes to laws that

have been approved by lawmakers.