President Donald Trump has said he "can't imagine why" US hotline calls about disinfectant have risen after he suggested injecting the substance to treat coronavirus.
The governors of Michigan and Maryland on Sunday blamed the president for the spike in such calls.
Following heavy criticism from medical professionals, Mr Trump said his remarks were made sarcastically.
Disinfectants are hazardous substances and can be poisonous if ingested.
During Monday's Covid-19 news conference, a reporter noted that the state of Maryland's emergency hotline had received hundreds of calls in recent days seeking guidance about Mr Trump's comments.
"I can't imagine why," the president said, moving quickly on. "I can't imagine that."
When asked whether he took responsibility at all for the increase in calls, Mr Trump replied: "No, I don't."
Last week, the Maryland governor's office said it had issued a statewide alert warning against ingesting or injecting disinfectants following the president's remarks.
Mr Trump made the disinfectant remarks on Thursday, after an official presented the results of US government research that showed Covid-19 could be killed in minutes by bleach.
"I see the disinfectant where it knocks it out in a minute. One minute," Mr Trump said. "And is there a way we can do something like that, by injection inside or almost a cleaning?"
On Friday afternoon, Mr Trump told journalists: "I was asking a question sarcastically to reporters like you just to see what would happen."
During Monday's Rose Garden press conference, Mr Trump was also asked whether he would delay the presidential election in November.
"I never even thought of changing the date of the election," he said. "Why would I do that?"
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