Add the cheese to a saucepan and melt over medium heat. Add the diced tomatoes and chiles, pimientos and jalapenos and mix. Pour into a chafing dish to keep warm.
2 pounds queso blanco-style processed cheese, such as Velveeta Queso Blanco, cut in 1/2-inch cubes
2 cans diced tomatoes and green chiles, such as Rotel
1 jar diced pimientos
2 jalapenos, seeded and chopped finely
Tortilla chips, for serving
Serve with tortilla chips.