Convicted terrorists to be detained longer

The federal government has vowed to fast-track moves to detain convicted terrorists beyond their sentences if they don't renounce their extremists views.

Federal, state and territory leaders agreed several months ago to develop a nationally consistent post-sentence preventative detention scheme for high risk terrorist offenders.

"We will act on this swiftly if we are re-elected on July 2," Finance Minister Mathias Cormann told ABC radio.