Ontario Premier Doug Ford is renewing his calls for tighter controls on domestic travellers and those who arrive through land crossings, saying Ottawa has yet to respond to his requests on these issues.The premier has issued another letter to Prime Minister Justin Trudeau, arguing additional measures — such as quarantine requirements for travellers coming into Canada by land — are needing to curb the spread of more contagious COVID-19 variants.Trudeau said last week that he was willing to work with Ontario to further limit the number of people allowed to enter the province, but said Ford had yet to follow up on his earlier requests.