The White House is planning to take a big step Wednesday toward preventing government agencies from doing business with Huawei, according to a senior administration official.

The Trump administration is expected to release a rule Wednesday afternoon that bans agencies from directly purchasing telecom, video surveillance equipment or services from Huawei. The prohibition was mandated by Congress as part of a broader defense bill signed into law last year.

"The administration has a strong commitment to defending our nation from foreign adversaries and will fully comply with Congress on the implementation of the prohibition of Chinese telecom and video surveillance equipment, including Huawei equipment," said Jacob Wood, a spokesman for the Office of Management and Budget.

The new rule, which will take effect Tuesday, also applies to a list of other telecom companies that have sparked security concerns, such as ZTE and Hikvision. In addition, the law set a deadline of August 2020 for a broader ban on federal contractors doing business with Huawei or the covered firms.

Contractors will be able to seek waivers from individual federal agencies if they do not believe their interaction with those companies poses a security threat.

The congressional mandate is separate from the Trump administration's own efforts to rein in Huawei's dominance in the industry.

The Commerce Department has put Huawei on a blacklist that effectively bans the export of goods to the company from the United States. U.S. chipmakers and tech firms can request waivers, and the chief executives of Google, Qualcomm, Micron, Intel and others met with President Donald Trump at the White House last month and urged the administration to issue those decisions quickly.