In the first official election campaign event since an Islamist suicide bomber murder 22 innocent victims at the Manchester Arena, Mr Nuttall warned politicians of other parties that “lighting candles and posting messages on social media isn’t enough.”
The Ukip leader, who had postponed the manifesto launch for 24 hours out of respect for the victims, promised to take "a far more muscular approach" to social integration.
Ukip more important than ever, says Nuttall ahead of manifesto launch
Ukip demands ISIS fighters forfeit passports after Manchester terror
Paul Nuttall put security at the heart of Ukip's manifesto as he warned against terrorism
He and Ukip deputy chairwoman Suzanne Evans, who wrote the manifesto, also took aim at Prime Minister Theresa May, attacking her record as home secretary which saw cuts to police and UK border staff.
Mr Nuttall said: "I believe that anyone who leaves this country to fight for Islamic State should forfeit their passport, their citizenship, and never be allowed to return.
It was the first official election campaign event since the suicide bomber in Manchester
"The fact that this Islamist terrorist targeted a concert which was primarily attended by children and teenagers simply proves that there is no depth to which these evil and warped individuals will not stop.
Lighting candles and posting messages on social media isn’t enough
"When I was elected leader of Ukip six months ago, I was clear right away that the threat posed to our people by Islamic fundamentalism was one of the major issues I and indeed all politicians would face in the coming years.
"I also identified the need to take a far more muscular approach to social integration and against segregation as a key policy area."
Mourning for Manchester: The world pays tribute
Thu, May 25, 2017
Get Quotes on Home Insurance
Makeshift memorials and tributes to victims of the deadly attack at an Ariana Grande concert.
1 of 41
Britain's Queen Elizabeth visits the Royal Manchester Children's Hospital in Manchester
Ukip's flagship policies include recruiting 20,000 extra police officers, 20,000 new soldiers, 7,000 more prison officers and 4,000 border guards.
Other policies include banning the burka, and taking tough legal action against female genital mutilation and forced marriages.
He also promised to secure Britain’s borders and remove the passports of those who join Isis and ban them from reentering the country.
Mr Nuttall criticised former home secretary Mrs May for cuts to police and the armed forces, as well as reducing the number of stop and searches and failing to control immigration.
Ms Evans went further, saying: "Theresa May might like to portray herself as a strong and stable leader who can tackle extremism, but her record suggests otherwise."
The Ukip leader promised to take 'a far more muscular approach' to social integration
She added: "Theresa May has allowed jihadists who fought alongside Islamic State back into our country.
"She has failed to prevent extremists spreading hatred in our universities and our mosques.
"Under her watch, even non-EU migration spiralled out of control and net migration reached record highs.
"A growing backlog of failed asylum seekers and a failure to deport illegal immigrants or foreign criminals were further hallmarks of her time as home secretary.
"Nothing will change if Theresa May wins a huge majority."
He promised to secure Britain’s borders and remove the passports of those who join ISIS
The party that forced the EU referendum has also issued six key Brexit tests which are “red lines” that the Government must not cross in the negotiations with Brussels.
They state Mrs May must not pay any exit fee, have “full control of our borders”, take back control of British fishing waters for 200 miles off the coast, have the right to negotiate trade deals, and be concluded by the end of 2019 at the latest.
Mr Nuttall dubbed his party the UK's "guard dog" and insurance policy as he outlined six tests to ensure Britain gets a good deal from the negotiations.
Other key policies in the Ukip manifesto include an extra £11 billion a year for the NHS and social care by the end of the next parliament, funded by cuts in foreign aid.
The party has pledged not to raise taxes, scrap VAT on takeaways and abolish the House of Lords and replace it with an English Parliament.