Loan on Rental property to pay primary home loan

[Venkat Na]

I currently have a loan on my primary home. And I also own a rental property with no loan. Now that standard deduction limits are changed in new tax law, I may not be able to use 'mortgage deduction' on primary home as it is less than standard deduction. Since I am sitting on equity on rental property, wondering if I should take a loan on rental property and use that money to pay off primary home loan. Any thoughts if this is a good idea? I am assuming that the interest paid on rental property loan will be bring down by taxable income on rental.