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Four major US tech companies have written to the US Trade Representative (USTR) asking for protection from the proposed third round of Trump tariffs.

Dell, Cisco, Juniper Networks and Hewlett Packard Enterprise warn the new taxes could result in US job losses.

The firms are worried the tariffs will increase their costs since many of their components come from China.

They say a duty of between 10-25% "would cause broad, disproportionate economic harm to US interests".

The last-ditch effort came as US public hearings on the upcoming tariffs ended.

The hearings examining the potential impact of the taxes wrapped up on Thursday, setting expectations that another round of tariffs could be imposed on $200bn (£154.7bn) of Chinese products as early as Friday.

Typically, however, the US has implemented tariffs within weeks, not days, of the end of public consultations.

The four tech firms are concerned that tariffs will increase the cost of items such as hard drives, servers and networking equipment, which could hit profits and result in job cuts in the US.

"Over time the reduced profits that the duties could cause could lead to hiring freezes, stagnant wages, and even job losses, as well as harm to investors such as reduced dividends and erosion of shareholder value," the companies wrote in the letter to the USTR, Robert Lighthizer.

They warned that an additional duty of up to 25% "would cause broad, disproportionate economic harm to US interests", including reduced spending on research and development and a slow down in innovations such as cloud computing and the rollout of 5G networks in the US.

The impact could be wide-ranging since the four firms make equipment commonly used by other tech companies, the government, and institutions such as schools and hospitals.

President Trump's trade war with China moved up a gear last month when the US brought in a 25% tax on a second wave of goods worth $16bn.

Tariffs had already been imposed on $34bn of Chinese goods in July. China has retaliated on both occasions with tariffs on the equivalent value of US goods.

In an interview with the ´óÏó´«Ã½'s Asia Business Report programme, HPE's chief executive Antonio Neri said the firm had "weathered the impact of the first two rounds of tariffs very well because it has a flexible and large scale supply chain".

While the firm stressed it was confident it would be able to make changes necessary to mitigate any impact of the tariffs, an HPE spokesperson said: "Changes to a tariff system that has worked well for decades is not the way to go for our country."