Apex domains cannot have CNAME records.
Question and response
Question
dig senado.gov.do. NS
Answer
senado.gov.do. 2 NS elle.ns.cloudflare.com.
senado.gov.do. 2 NS maxim.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0