Mr Palmer said he was also travelling to meet Perth-based staff at his mining company Mineralogy to discuss the logistics and supply of the 32.9 million doses of the anti-malarial drug hydroxychloroquine he plans to donate to the Australian government's national medical stockpile to study its effectiveness against COVID-19.
"I put in for an exemption and I gave them two copies of letters from the health department confirming what we were doing,I'd advised them who I was meeting with over there and they said,'no we don't think that qualifies',"he said.
"Then I explained about having the[Minerology] office and this sort of stuff and they said,'well you can get an exemption from the[WA Police] commissioner but you'd have to tell us where you were going,who you were meeting and what you were discussing while you are here'.
"I said I wasn't prepared to accept that sort of police supervision while I was in WA."
Mr Palmer said there were no medical reasons for the closures to still be in place and they breached Section 92 of the Constitution which states:"trade,commerce,and intercourse among the States,whether by means of internal carriage or ocean navigation,shall be absolutely free."
The Queensland-based mining magnate said his legal team would commence the High Court challenge early next week.
The WA government through the WA Police has issued exemptions throughout the pandemic.