On the threat of invasion, Morrison said, “Of course, none of that’s true.”
Morrison rejected the center-left opposition Labor Party’s advice to telephone Sogavare.
“I can tell you very clearly that I am following very carefully the advice that I get from our security intelligence agencies in how we are responsibly managing the issues in relation to this matter,” Morrison told reporters. “That is exactly what I’m doing.”
Morrison said he had had contact with Sogavare "in the last few months,” but did not specify when.
Opposition leader Anthony Albanese has promised closer engagement between Australia and its South Pacific neighbors if Labor wins elections on May 21.
“The fact that the prime minister hasn’t picked up the phone to Prime Minister Sogavare says an enormous amount ... about what is needed in terms of that relationship,” Albanese said.
“The government has dropped the ball on the Pacific right now,” Albanese added.
Morrison said last month that Australia and the United States shared the same “red line” when it came to opposing a Chinese military base on the Solomon Islands. Neither Australia nor the United States has said how they might respond to such a Chinese presence.
Sogavare has maintained that there will be no Chinese base in his country.
“We are being treated as kindergarten students walking around with Colt .45s in our hands, and therefore we need to be supervised. We are insulted,” Sogavare said on Wednesday.
Sogavare condemned the "glaring hypocrisy” of critics of his deal with China. The United States, Australia and Britain secretly negotiated a trilateral partnership announced in September that will allow Australia to obtain nuclear-powered submarines.
Chinese Foreign Ministry spokesperson Zhao Lijian said Sogavare's criticisms "reflected the shared voice of the Pacific island countries.”
“It also proves that the accusations made by the U.S. and Australia against China are purely double standards," Zhao said.
Morrison said Australia needed to be “calm and composed” in dealing with the Solomon Islands.
“Mr. Sogavare has entered into a secret arrangement with the Chinese government, he has done that with a number of his Cabinet ministers,” Morrison said.
“That did not come as a surprise to our government and so now we just work responsibly with our partners to manage that situation to first protect the security interests of Australia but also of the Solomon Islands,” Morrison said.
“We are very concerned for the Solomon Islands. We’re very concerned for the broader security in the Southwest Pacific. Other leaders that I’ve been in regular contact (with) are equally concerned,” Morrison said.
Labor has condemned the China-Solomon Islands pact as Australia’s biggest foreign policy failure in the Pacific since World War II.
Morrison said Australia remained the Solomon Islands’ preferred security partner despite the new pact.
Australia already has a security pact with the Solomon Islands and Australian police peacekeepers have been in the capital, Honiara, since riots in November.