When US senators Mark Warner and Marco Rubio in a letter in recent days told Canadian Prime Minister Justin Trudeau to keep China's tech and telecom giant Huawei out of its plans to build a new-generation mobile network, they were being presumptuous.

They need to be reminded that what they are doing is against the principles of free competition, which the United States repeatedly uses as an excuse to find fault with China, whose economy the US has long refused to recognize as a market one. That is part of the reasons why the Trump administration has imposed tariffs on imports from China.

US senators writing letters to the prime minister of a third country to dictate what that country should do or not do goes far beyond normal friendly relations.

For them as senators of a world power claiming to be a strong advocate of free world stronghold to be bold enough to flout the principles of global economy and world politics in such a manner is unbelievable. It is an interference with that country's internal affairs.

What sustains their audacious behavior is both the political bias against China in the US and their arrogance in being senators of that country, which is the world's sole superpower.

With political bias against China, they think only in terms of political ideology when it comes to anything that is related to China. They have gone too far to show any respect to trade rules and principles of international relations.

With arrogance and haughtiness as US senators, they believe that they are eligible to lord it over any other nation. For US politicians it seems that international rules are only for other countries to observe, and they do not apply to the US, when they are not in its interests.

However, when the US overemphasizes its political bias and puts its own interest before that of the rest of the world, the global economy is in jeopardy and so are normal international relations.

The US believes that other countries must follow what it dictates, and it is willing to take actions against them if they don't.

It is certainly unfair for Huawei, a Chinese technology and telecom company, to suffer because of man-made market barriers. It is not in the interests of those countries which have long been supplied with Huawei's equipment for telecommunications and neither is it in the interests of normal market competition.