His Private Member's Bill is based on a Swedish law brought in 15 years ago, which criminalises anyone who pays for sex.
"I believe we need to go forward and criminalise those who seek to purchase sexual services," he said.
"It seeks to reduce demand for sexual services, a majority driver for human trafficking in our province."
The legislation would not pursue the person giving sexual services and a child trafficking guardian would be set up to speak up for victims under the proposals.
It could set a two-year prison sentence for trafficking or slavery offences.
Criminalising paying for sex would simplify the current law and make it easier to secure convictions that send a clear message to traffickers.
Lord Morrow, DUP
Monday's debate comes after public comments at the weekend from ACC Drew Harris.
He said: "The PSNI position is clear in that we do not support the liberalisation of laws in relation to prostitution," he said.
"We are striving to find better ways to tackle the serious problem of prostitution and human trafficking and are keen to be part of the wider societal debate about how we can collectively minimise harm caused by prostitution."
The Fermanagh & South Tyrone Peer representative responded by saying "it is unfortunate that the PSNI has become publicly involved in this debate and opposing his Bill".
Lord Morrow noted that the Chief Constable has said that the police will enforce the Bill if passed but questioned if the PSNI's media campaign against the Bill was "overstepping its role".
He said the PSNI "has publicly entered the political arena to oppose the introduction of my Bill".
Human trafficking is a very complex issue and we need to allow the PSNI to focus resources to ensure they can bring to justice those who perpetrate this heinous crime.
Steven Agnew, Green Party
The Green Party in Northern Ireland has given a qualified welcome to the introduction of a Bill to combat human trafficking.
"More needs to be done to tackle the misery of human trafficking and there is much in this Bill I would support," Green Party Leader Steven Agnew MLA said.
"We do, however, have concerns that the addition of clause 6, which criminalises the purchase of sex, too bluntly conflates the problems associated with human trafficking and prostitution.
"Including the criminalisation of prostitution into this Bill could stretch the police's resources so thinly that they are unable to investigate human trafficking offences with the necessary rigour to bring forward prosecutions, something which is already notoriously difficult.
While Sinn Féin MLA Rosie McCorley has said the Bill needs further scrutiny to develop a legislation that fully protects women and children.
"While there is no doubt a connection between human trafficking and prostitution the reality is far more complex so it is important that any legislation is not rushed and that it protects against all aspects of trafficking and the sex trade," she commented.
"I would like to see a further more extensive consultation with all concerned parties to ensure that we get the best legislation possible to protect women and children."
There may also be serious consequences from the proposed changes to the law on prostitution which could push it further underground and prevent victims from contacting the police for fear of prosecution.
Stewart Dickson, Alliance
UUP Justice Spokesperson, Tom Elliott MLA said his party would support the passage of the Bill at this stage, but has raised a number of concerns.
He said there were a few issues including current legislation already covering certain clauses and some clauses "may be unnecessary".
"There has also been considerable debate over clause 6 which would have the effect of banning the act of paying for sex," Mr Elliott said.
"There are strong arguments in support of and opposition to the clause, including opposition from the PSNI to this aspect of the Bill.
"We need to see strong evidence that criminalising the payment of prostitutes will impact on human trafficking."
Alliance Justice spokesperson Stewart Dickson MLA has said that the Bill will send out a strong message against those behind human trafficking, but also raised concerns on certain aspects of the legislation.
"There could be serious implications for judicial discretion with the minimum sentencing guidelines outlined in this Bill," he said. "A judge needs to be free to make the most appropriate ruling in each case based on his or her assessment of the particular offender, crime, victims and circumstances.
"I am also concerned by the proposal for the equal treatment of children and adults involved in human trafficking. Children should not be subject to the same sentences as adults, which is why I believe that this Bill is not 'in the best interests of the child' as demanded by the UN Convention on the Rights of the Child.
"We will be supporting this Bill at its Second Stage but will seek to make significant changes as it progresses through the Assembly."