Yes, continue to focus on the flawed climate science:

The CNN video ridicules Trump for saying that global warming is “an expensive hoax.” We should respond by outlining the costs involved. Over one billion dollars a day worldwide is now spent on “climate finance,” according to the San Francisco-based Climate Policy Initiative, yet we see no impact on climate. In 2017, Dr. Bjorn Lomborg, president of the Copenhagen Consensus Center, explained that if the UN Paris Agreement targets for 2030 were met and sustained through the rest of the century, there would be 0.3 degrees Fahrenheit less warming in 2100, if the models relied upon by the UN were correct. He explains that the cost of the Paris pact would be $1 – 2 trillion every year. So clearly, CNN’s criticism tells Trump that he should continue calling it “an expensive hoax,” and cite the cost estimates and forecast results to illustrate his point.

Yup.