A security fence is installed across the lawns of Parliament House in Canberra.

A security fence is installed across the lawns of Parliament House in Canberra.Credit:Andrew Meares

Tasmanian Labor MP Brian Mitchell criticised the construction,despite joining his party and the government in voting to approve it in Parliament last year.

"Not the Parliament's finest hour,"he wrote on Twitter on Tuesday,adding he would"have to wear that I voted for it. Stand by the comment."

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"Presiding officers took the view under advice it was necessary - many not happy but we let it through so must wear it."

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