Coalition senator Cory Bernardi has posted a selfie wearing a red Donald Trump-style baseball cap with the words 'Make Australia Great Again'.

The South Australian senator posted the image to Twitter with the caption 'Make Australia Great Again'.

He is currently on secondment in the US representing Australia at the United Nations, reported the Herald Sun.

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Liberal senator Cory Bernardi has posted a selfie wearing a red Donald Trump-style baseball cap with the words 'Make Australia Great Again' (pictured)

Labor's Linda Burney criticised the tweet from Senator Bernardi, saying he was on a 'taxpayer funded trip to NY to support Trump'

The cap is a replica of one that is often worn by Republican US presidential candidate Donald Trump.

When asked on Twitter where he got the cap from, Senator Bernardi said it was a birthday gift.

Fellow MPs have accused Senator Bernardi of supporting Donald Trump while on a taxpayer-funded trip.

Senator Bernardi's hat is similar to one worn by Republican presidential candidate Donald Trump (pictured)

In response to the photo, Labor member for Barton Linda Burney tweeted 'Taxpayer funded trip to NY to support Trump vs a few (free) tweets? One of these things is not like the other.'

Senator Bernardi's response was: 'There's a Labor Senator here too who is supporting Hillary, my tweets are free too #hypocrite.'

Senator Bernardi has been fairly vocal on social media with his support of Donald Trump and his criticism of Hillary Clinton, tweeting on Sunday 'Labor don't like me supporting Trump but ok with their own tweeting support for crooked Hillary'.

He only follows one other person on Twitter - Donald Trump's official account.

Senator Bernardi has been fairly vocal in his criticism of Democratic presidential candidate Hillary Clinton (pictured)

Labor Senator Penny Wong tweeted last week that Prime Minister Malcolm Turnbull needed to 'pull Bernardi into line'

Federal labor member for Lilley Wayne Swan tweeted 'FYI Cory - Australia has always been great.'

Last Thursday, South Australia Labor Senator Penny Wong tweeted: 'Turnbull needs to pull Bernardi into line. He's not in NYC to campaign for Trump. He's representing the Aust. Parlt. Funded by the taxpayer.'