Beijing: China on Monday warned students and academics on the "risk" of studying in the United States, citing an uptick in visa denials and delays amid a trade war and other tensions.

The education ministry in a statement urged students to "strengthen risk assessment... and make relevant preparations".

The ministry said Chinese students and academics have experienced visa restrictions, delays in obtaining them, and visas with shorter duration.

China is the biggest source of international students on US campuses, with 360,000 of them last year, or a third of the foreign student body, with many paying full tuition.

The warning comes after FBI director Christopher Wray said in April that Beijing has used Chinese graduate students and researchers, among others, in its economic espionage efforts in the United States.

Last month, Republicans in the US Congress introduced legislation aimed at barring Chinese military scientists from obtaining visas to study or work in the United States.

The bills in the House and Senate would compel the White House to identify a list of research and scientific institutions that the president determines are affiliated with or funded by the People's Liberation Army.

The PLA Visa Security Act would prevent people currently or formerly employed or sponsored by such entities from entering the United States on student or research visas.

China's state-run Global times has published accounts from several Chinese academics saying their 10-year visas to the US were cancelled, with officials citing concerns about links to Chinese intelligence.

US scholar Michael Pillsbury, who advises US President Donald Trump on China, said his visa to enter the country for a forum earlier this year was blocked in apparent retaliation.

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Chandigarh (PTI): In a setback to the ruling BJP in Haryana amid the Lok Sabha elections, three Independent MLAs today announced that they have withdrawn their support to the Nayab Singh Saini-led government in the state.

The three MLAs - Sombir Sangwan, Randhir Gollen and Dharampal Gonder - also said that they have decided to extend support to the Congress during the elections.

They made the announcement at a press conference held in Rohtak in presence of former Haryana chief minister Bhupinder Singh Hooda and state Congress chief Udai Bhan.

"We are withdrawing support to the government. We are extending our support to the Congress," Mr Gonder said.

"We have taken this decision on various issues including those related to farmers," he said.

Speaking at the press meet, Udai Bhan said, "The three Independent MLAs - Sombir Sangwan, Randhir Singh Gollen and Dharampal Gonder - have withdrawn their support to the BJP government and extended their support to the Congress."

"I also want to say that present strength of (90-member) Haryana Assembly is 88, of which the BJP has 40 members. The BJP government earlier had support of JJP MLAs and Independents, but JJP had also withdrawn support and now Independents are also leaving.

"Nayab Singh Saini government is now a minority government. He should tender his resignation as he does not have right to stay even for a minute," said Mr Bhan.

Now, the assembly polls should be held immediately, he said.