US President Donald Trump has pointed the finger of blame at Barack Obama and "his people" for the ongoing demonstrations against his administration, adding that they were likely responsible for the leaks coming out of the White House as well.

Key points: Trump concedes that he has not communicated well to the American people

Trump concedes that he has not communicated well to the American people Responding to criticism, Trump says the US will be a "one party system soon"

Responding to criticism, Trump says the US will be a "one party system soon" He gives himself an 'A' for achievement, but a 'C' for communication

He gives himself an 'A' for achievement, but a 'C' for communication Trump says he will clarify his positions in a speech to Congress today

"I think that President Obama is behind it because his people are certainly behind it," Mr Trump said with regards to the protests during an interview with Fox News.

"I think he is behind it. I also think it is politics, that's the way it is."

He added: "And some of the leaks possibly come from that group [which are] very serious leaks because they are very bad in terms of national security."

Mr Trump provided no evidence to back up his claims the former president had a hand in orchestrating the rallies or facilitating the leaks.

However in the same interview, Mr Trump acknowledged that he may have not communicated his policies well enough to the American people during his first month in office, but hopes to reverse that in a historic speech to Congress today.

"In terms of achievement, I think I'd give myself an A. Because I think I've done great things. But I don't think I have — I and my people — I don't think we've explained it well enough to the American public," he told the hosts of Fox & Friends.

"I think I get an A in terms what I've actually done but in terms of messaging I'd give myself a C or a C plus."

When probed about recent criticisms from Democrats that he had "basically done nothing" during his first month as president, Mr Trump said he expected the US to have a one-party system "soon" citing an alleged shrinking of the Democratic Party.

"In a certain way, I hate to see it, because I like a two-party system, and we're soon going to have a one-party system."

'Maybe it's my fault': Trump

Mr Trump will lay out plans for the next year later today in a speech to Congress after a rocky start to his presidency, marked by the resignation of his national security adviser and the troubled rollout of his executive order temporarily banning people from seven Muslim-majority nations.

Mr Trump also recently broadened the categories of people who could be targeted for immigration enforcement to anyone who had been charged with a crime, removing an Obama-era exception for people convicted of traffic misdemeanours.

On Monday, Californian officials demanded information from the Trump administration on the arrests and raids in the most populous US state, citing reports that immigration agents had gone to churches, schools and courthouses to find illegal immigrants.

Mr Trump has insisted that agents are targeting dangerous criminals, not ordinary people.

When asked if that has been communicated effectively, Mr Trump said: "I don't think so. No, I don't think it's been — maybe it's my fault."

Invited to say how he would change his messaging, he said "maybe I change it during the speech" referring to today's Congress address.

"Because, you know, frankly, I'm going to be discussing a lot of [the aforementioned topics]."

ABC/wires