How to set CFrame of the ViewportFrame camera to the CFrame of the main camera?

Hello all, so today I am trying to match up the ViewportFrame camera with the main camera by setting it's CFrame. I have code attached. The script is the child of the ViewportFrame.

wait(3)

while 2+2==4 do

local viewportFrame = script.Parent

local viewportCamera = Instance.new("Camera")
viewportFrame.CurrentCamera = viewportCamera
viewportCamera.Parent = viewportFrame

local camera = workspace.CurrentCamera
local cameraCFrame = camera.CFrame
local viewCFrame = viewportCamera:GetRenderCFrame()

viewportCamera.CFrame = CFrame.new(Vector3.new(cameraCFrame))
print(viewCFrame)
wait(0.1)


end

Thank you! Any help is appreciated.