US President Donald Trump's son-in-law Jared Kushner has insisted he had no improper contacts with Russian officials during the 2016 presidential campaign.

He made the remarks at the White House after appearing before a Senate committee investigating Moscow's alleged meddling in the US election.

"The record and documents I have voluntarily provided will show that all of my actions were proper and occurred in the normal course of events of a very unique campaign," Mr Kushner said after a closed-door hearing of the Senate's Intelligence Committee.

"Let me be very clear - I did not collude with Russia, nor do I know of anyone else in the campaign who did so. I had no improper contacts."

Mr Kushner is also scheduled to address a House of Representatives intelligence panel tomorrowas politicians try to determine whether Mr Trump's campaign enlisted Russia's help to win the White House in last year's election.

Mr Trump has been dogged by allegations that his campaign aides worked with Russia, which US intelligence agencies have accused of interfering in the election.

Moscow has denied any interference, and Mr Trump says his campaign did not collude with Russia.

He took to twitter today to denounce the ongoing investigation.

Mr Trump's son, Donald Trump Jr, released emails this month that showed he appeared to welcome the prospect of damaging information from the Russian government about Mr Trump's Democratic rival, Hillary Clinton.

Members of both committees say they are eager to hear about the June 2016 meeting involving Russian lawyer Natalia Veselnitskaya.

Mr Trump Jr, Mr Kushner and former Trump campaign manager Paul Manafort all participated in the meeting.

Mr Kushner has described the meeting as a waste of time.

"I actually emailed an assistant from the meeting after I had been there for ten or so minutes and wrote 'Can u pls call me on my cell? Need excuse to get out of meeting'."

Another congressional panel, the Senate Judiciary Committee, is negotiating with Mr Manafort and Mr Trump Jr about testifying in a public hearing.

Mr Kushner will also face questions about reports he tried to set up a secret back channel to Moscow, as well as other contacts with top Russian officials and business leaders during the presidential campaign and the transition period before he took office.

Mr Kushner said he first met Russian Ambassador Sergey Kislyak in Washington in April 2016 and shook hands.

He said he did not recall phone calls with Mr Kislyak between April and November of that year as reported by Reuters, had not found evidence of the calls in phone records and was sceptical they took place.

In a meeting with Mr Kislyak after the election, on 1 December, Mr Kushner said he articulated a desire for the United States to have a fresh start with Russia.

"The fact that I was asking about ways to start a dialogue after election day should of course be viewed as strong evidence that I was not aware of one that existed before election day," he said.

Mr Kushner did not initially disclose any meetings with Russians on forms he filed to get a government security clearance.

He has since revised those forms several times.

Mr Kushner said the form was initially submitted prematurely in error and omitted all foreign contacts he had had, not just those with Russian officials.

Mr Trump says the investigations in Congress and the Justice Department are politically motivated.

"As the phony Russian Witch Hunt continues, two groups are laughing at this excuse for a lost election taking hold, Democrats and Russians!" the president wrote on Twitter yesterday.