Sefton Central Labour MP Bill Esterson and new Ravenmeols Labour Councillor Catie Page strengthened their calls for the town's greenbelt to be saved after visiting the Core Strategy presentation this week.
The drop-in event was held at the Formby Pool.
After attending the event, Cllr Page said she was determined to fight to save the greenbelt.
Cllr Page said: "After looking at the Core Strategy documentation, I am more determined than ever that we need to preserve our greenbelt land in Formby and Ince Blundell.
"We have some of the finest agricultural land in the country right here and we need to make sure that that isn't ploughed up in the rush to build housing.
"We want to see all of the other options investigated first, which includes reclaiming brownfield sites for potential development and also revisiting the statistics on just how many homes are going to be needed here in Sefton.
"Our greenbelt land is precious. Once it is gone, it is gone - and there will be no going back.
"The Labour Party set up the greenbelt after the Second World War and we are the only party that will protect the greenbelt for future generations."
Sefton Central Labour MP Bill Esterson said thousands of people have so far signed the Labour petition to Save the Greenbelt in Sefton.
Bill said: "This Tory-Lib Dem government kicked open the door for developers to come in and build on our greenbelt when they relaxed planning regulations earlier this year.
"Since then, we have been working hard to safeguard our countryside here in the borough. Around Ince Blundell, Formby and Hightown we have some of the finest farming land in the country. This is farming land which is far too valuable to allow to be destroyed.
"So we will continue the fight to save it.
"I am also very concerned that some of the land which is being identified as potential sites for building are also flood plains.
"I recently backed an amendment to the Localism Bill which essentially puts local communities at the heart of the planning process. So if this bill is passed in Parliament, we will be able to ensure that the local community gets the final say on any plans to build on greenbelt or any other planning applications."
Bill Esterson is scheduled to speak at a Campaign to Protect Rural England public debate on building on the greenbelt on July 15 at 7pm at Old Christ Church in Waterloo.