WASHINGTON: A nuclear-armed Pakistan is a "very, very vital problem", Republican presidential front-runner Donald Trump has said and asserted that the country needs to "get a hold of" its situation."Pakistan is a very, very vital problem and really vital country for us because they have a thing called nuclear weapons. They have to get a hold of their situation," Trump told CNN during a town hall in Wisconsin, where the Republican presidential primary is scheduled for April 5."When I see that and when I see it put in a park because it was mostly Christians, although many others were killed other than Christians, I think it's just absolutely a horrible story," he said referring to the terrorist attack in Lahore on Easter Sunday that claimed 74 lives and injured over 300 others."I'm talking about radical Islamic terrorism. I will solve it far better than anybody else running," Trump said in response to a question.A large number of people were present at the crowded Gulshan-e-Iqbal Park of Allama Iqbal Town in Lahore when a powerful blast took place on Sunday . A large number of Christian families were present in the park due to Easter Sunday.The brutal attack by a suicide bomber - believed to be in his 20s - was claimed by the Jamaatul Ahrar, a splinter group of the Tehrik-i-Taliban Pakistan (TTP).Earlier this month, Trump had said that the "US needs to stay in Afghanistan because its immediate neighbour Pakistan has nuclear weapons which have to be protected"."I think you have to stay in Afghanistan for a while, because of the fact that you are right next to Pakistan, which has nuclear weapons and we have to protect that. Nuclear weapons change the game," he said.Last year, Trump had called Pakistan the most dangerous country in the world. In an interview, he had indicated that Pakistan needs to be denuclearize.